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Prime and Composite Numbers - 4

Description: Prime and Composite Numbers - 8
Number of Questions: 25
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Tags: Prime and Composite Numbers - 8 Prime Numbers and Composite Numbers Prime numbers
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Which of the following is a prime number?

  1. 14

  2. 15

  3. 16

  4. 17

Show answer
Correct Option: D
Explanation:

17 is a prime number because it has only 2 factors 1 and 17.

How many factors does a prime number have?

  1. 0

  2. 1

  3. 2

  4. 3 or more

Show answer
Correct Option: C
Explanation:

A prime number has only 2 factors and they are 1 and the number itself.

23 is a _____.

  1. prime number

  2. composite number

  3. negative number

  4. surd

Show answer
Correct Option: A
Explanation:

23 is a prime number as it has only 2 factors 1 and 23 itself

Which prime number is the predecessor of 47?

  1. 41

  2. 42

  3. 43

  4. 47

Show answer
Correct Option: C
Explanation:

43 is a prime number before 47.

Which of the following prime numbers is the successor of 67?

  1. 67

  2. 71

  3. 73

  4. 79

Show answer
Correct Option: B
Explanation:

The next prime number after 67 is 71.

Which is the only prime as well as an even number?

  1. 2

  2. 3

  3. 5

  4. 7

Show answer
Correct Option: A
Explanation:

The number which is both a prime and an even number is 2.

Which of the following factors of 176 is a prime number?

  1. 4

  2. 8

  3. 11

  4. 16

Show answer
Correct Option: C
Explanation:

Prime factors of 176 are - 2 × 2 × 2 × 2 × 11. So, out of the given options 11 is the required prime number.

Which of the following statements is true about a prime number?

  1. A prime number can be a negative number.

  2. A prime number has more than 2 factors.

  3. A prime number has two factors, the number itself and any other odd number

  4. A prime number has two factors, the number itself and 1

Show answer
Correct Option: D
Explanation:

The true statement here is a prime number has only 2 factors 1 and the number itself.

The product of two odd prime numbers is always ____.

  1. Odd

  2. Even

  3. Can be both even and odd

  4. Either odd or even

Show answer
Correct Option: A
Explanation:

The product will always be an odd number eg 5 × 3 = 15, 3 × 7 = 21, 7 × 11 = 77.

A prime number always ends with which of the following digits?

  1. 1, 3, 5, 7

  2. 1, 3, 5, 9

  3. 1, 3, 7, 9

  4. 1, 5, 7, 9

Show answer
Correct Option: C
Explanation:

The numbers ending with 1, 3, 7, 9 only can be prime.

Which prime number is the predecessor of 113?

  1. 103

  2. 107

  3. 109

  4. 113

Show answer
Correct Option: C
Explanation:

Before 113, 109 is a prime number.

Which of the following factors of 91 are prime numbers?

  1. 1, 7

  2. 7, 13

  3. 13, 19

  4. 7, 23

Show answer
Correct Option: B
Explanation:

91 = 7 × 13. So, prime factors of 91 are 7 and 13.

How many prime numbers are there which end with 5?

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: A
Explanation:

There is only one such prime number which is 5 itself.

Which of the following numbers is prime?

  1. 111

  2. 121

  3. 131

  4. 141

Show answer
Correct Option: C
Explanation:

131 is a prime number because it has only 2 factors 1 and 131 itself.

Which of these is a prime factor of 121?

  1. 7

  2. 11

  3. 13

  4. 19

Show answer
Correct Option: B
Explanation:

121 = 11 × 11 So, 11 is a prime factor of 121.

Which of the following prime numbers is the successor of 211?

  1. 211

  2. 223

  3. 227

  4. 229

Show answer
Correct Option: B
Explanation:

The next prime number after 211 is 223.

The product of an even and odd prime number is always _____.

  1. Even number

  2. Odd number

  3. Neither even nor odd

  4. Either even or odd

Show answer
Correct Option: A
Explanation:

The product will always be an even number.

Which of the following numbers is a prime factor of 97?

  1. 1

  2. 17

  3. 23

  4. 97

Show answer
Correct Option: D
Explanation:

97 is a prime number with 1 and 97 as the only factors.

How many prime numbers are there between 90 and 100?

  1. 4

  2. 3

  3. 2

  4. 1

Show answer
Correct Option: D
Explanation:

Prime numbers between 90 and 100 is 97 only.

Which of the following is a prime number?

  1. 351

  2. 352

  3. 353

  4. 357

Show answer
Correct Option: C
Explanation:

353 is a prime number because it has only 2 factors which are 1 and 353.

Which of the following intervals has minimum prime numbers?

  1. 90 to 100

  2. 70 to 80

  3. 30 to 40

  4. 10 to 20

Show answer
Correct Option: A
Explanation:

90 and 100 has only 1 prime number i.e. 97.

Which of the following intervals has maximum numbers as prime?

  1. 90 to 100

  2. 70 to 80

  3. 30 to 40

  4. 10 to 20

Show answer
Correct Option: D
Explanation:

10 to 20 interval has the maximum prime numbers. They are 2, 3, 5, 7

Which of the following options is the common prime number in intervals 90 - 100 and 91 - 105?

  1. 103

  2. 101

  3. 97

  4. 93

Show answer
Correct Option: C
Explanation:

97 is a prime number which has only 2 factors 1 and 97.

How many 2 digit prime numbers are there that end with 5?

  1. 3

  2. 2

  3. 1

  4. 0

Show answer
Correct Option: D
Explanation:

Only 5 is a prime number which ends with 5, which is 1 digit number. There is no 2 digit prime number that ends with 5.

The length of a rectangle is 2 cm. By what number, the length of the rectangle should be multiplied so that the area of the rectangle remains a prime number?

  1. 1

  2. 2

  3. 3

  4. 4

Show answer
Correct Option: A
Explanation:

Length of rectangle = 2 cm, so it should be multiplied by 1, so that 2 x 1 = 2 is a prime number. Length = 2 cm, width = 1 cm, Area = 2 x 1 = 2 cm2 (a prime number)

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