The numbers that have only two factors, 1 and the number itself, are called ______.

Which of the following are prime numbers?

How many prime numbers are there between 10 and 30?

Which smallest number should be subtracted from 40 to make it prime number?

How many prime numbers are there between 1 and 20?

Which of the following conditions is true for prime numbers?

If 2 is a factor of x, can x be a prime number?

What is the difference between the smallest and the largest three digit prime numbers?

What is the difference between the first two odd prime numbers?

Which of the following is even prime number?

How many prime numbers are there between 1 and 50?

How many even prime numbers are there between 1 and 20?

Which of the following is not a prime number?

Which of the following number is a prime number?

Sally owns a bookshop and keeps record of the number of books sold in a day. At the end of the month, she observes that the total number of books sold by her is a prime number. Which of the following can be the number of books sold?

Which of the following is not a multiple of 23?

How many prime numbers are there between 90 and 100?

Find the common prime factor of 21 and 35.

What is the difference between the first two 3-digit consecutive prime numbers?

If 'a' is the sum of the first 5 prime numbers and 'b' is the smallest odd prime number, what will be the value of a + b?