31 is prime.
31 is prime.
961 is not prime. 961 = 31 * 31
21 is composite number that is a multiple of 3. 31 is a prime number.
13 prime 63 composite 61 prime 31 prime Well the question should have been either, Which one of these numbers is not a composite number? Or, Which one of these numbers is not a prime number?
31 is prime.
It is a prime.
31 is prime.
31 is prime.
31 is a prime number
31 is a prime number.
Composite. Its prime factors are 23 and 31.
27 and 31 are prime.
961 is not prime. 961 = 31 * 31
39 is a composite number 1 is neither prime nor composite number 31 and 41 are prime numbers.
31 is a prime number
No, it is a prime number.