31 is 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.
39 is a composite number 1 is neither prime nor composite number 31 and 41 are prime numbers.
961 is not prime. 961 = 31 * 31
31 is a prime number
No, it is a prime number.
31 is a prime number because it is only divisible by 1 and itself.