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Prime Numbers

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23 is a _____.

  1. prime number

  2. composite number

  3. negative number

  4. surd


Correct Option: A
Explanation:

23 is a prime number as it has only 2 factors, i.e. 1 and 23 itself.

Which prime number is the predecessor of 47?

  1. 41

  2. 42

  3. 43

  4. 47


Correct Option: C
Explanation:

43 is the prime number that precedes 47.

Which of the following is a prime number?

  1. 14

  2. 15

  3. 16

  4. 17


Correct Option: D
Explanation:

17 is a prime number because it has only 2 factors, i.e. 1 and 17 (number itself).

Which of the following is a prime number?

  1. 351

  2. 352

  3. 353

  4. 357


Correct Option: C
Explanation:

353 is a prime number because it has only 2 factors, i.e. 1 and 353 (number itself).

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

  1. 61

  2. 71

  3. 73

  4. 79


Correct Option: B
Explanation:

The next prime number after 67 is 71.

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

  1. 4

  2. 8

  3. 11

  4. 16


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 is the only even prime number?

  1. 2

  2. 3

  3. 5

  4. 8


Correct Option: A
Explanation:

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

Which of the following statements is true?

  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.


Correct Option: D
Explanation:

The true statement is that a prime number has only 2 factors, i.e. 1 and the number itself.

Which of the following numbers with '1' at its units place is a prime number?

  1. 111

  2. 121

  3. 131

  4. 141


Correct Option: C
Explanation:

131 is a prime number because it has only 2 factors, i.e. 1 and 131 (number itself).

The numbers ending in which of the following digits can be prime numbers?

  1. 1, 3, 5, 7

  2. 1, 3, 5, 9

  3. 1, 3, 7, 9

  4. 1, 5, 7, 9


Correct Option: C
Explanation:

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

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


Correct Option: A
Explanation:

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

Which prime number is the predecessor of 113?

  1. 106

  2. 107

  3. 109

  4. 113


Correct Option: C
Explanation:

The predecessor prime number of 113 is 109.

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

  1. 211

  2. 223

  3. 227

  4. 229


Correct Option: B
Explanation:

The successor prime number of 211 is 223.

How many prime numbers are there that end in 5?

  1. 1

  2. 2

  3. 3

  4. 4


Correct Option: A
Explanation:

There is only one such prime number, i.e. 5 itself.

How many factors does a prime number have?

  1. 0

  2. 1

  3. 2

  4. 3 or more


Correct Option: C
Explanation:

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

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

  1. 7

  2. 17

  3. 23

  4. 97


Correct Option: D
Explanation:

97 is a prime number so prime factors of 97 are 1 and 97.

Which of the following options is a prime factor of 121?

  1. 7

  2. 11

  3. 13

  4. 19


Correct Option: B
Explanation:

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

Which of the following options represents the prime factors of 91?

  1. 1, 7

  2. 7, 13

  3. 13, 19

  4. 7, 23


Correct Option: B
Explanation:

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

How many prime numbers are there between 100 and 120?

  1. 3

  2. 4

  3. 5

  4. 6


Correct Option: C
Explanation:

There are 5 prime numbers between 100 and 120. These are 101, 103, 107, 109 and 113.

Which of the following prime numbers lies between both the intervals 90 - 100 and 91 - 105?

  1. 107

  2. 103

  3. 101

  4. 97


Correct Option: D
Explanation:

97 is a prime number, which lies between both the intervals (i.e. 90 - 100 and 91 - 105).

How many prime numbers are there between 90 and 100?

  1. 4

  2. 3

  3. 2

  4. 1


Correct Option: D
Explanation:

There is only one prime number (i.e. 97) between 90 and 100.

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

  1. even

  2. odd

  3. neither even nor odd

  4. either even or odd


Correct Option: A
Explanation:

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

Which of the following intervals has the maximum number of prime numbers?

  1. 90 to 100

  2. 70 to 80

  3. 30 to 40

  4. 1 to 10


Correct Option: D
Explanation:

The interval 1 - 10 has the maximum number of prime numbers. These prime numbers are 2, 3, 5 and 7.

Which of the following intervals has the minimum number of prime numbers?

  1. 90 to 100

  2. 70 to 80

  3. 30 to 40

  4. 10 to 20


Correct Option: A
Explanation:

The interval 90 - 100 has the minimum number of prime numbers. There is only 1 prime number, i.e. 97.

How many prime numbers are there between 0 and 10?

  1. 0

  2. 1

  3. 2

  4. 4


Correct Option: D
Explanation:

There are 4 prime numbers between 0 and 10. These numbers are 2, 3, 5 and 7.

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