4 is composite, 31 is prime.
31 and 61 are prime, the rest composite.
31 and 47 are prime, the rest composite.
31 is a prime number because it has only two factors which are itself and one
31, 37, & 41 are prime; 32,33,34,35,36,38,39 & 40 are composite.
An integer greater than 1 can be composite or prime but not both. So 31 cannot be a composite prime.
31 is prime.
31 is prime. 32 and 33 are composite.
31 is prime.
4 is composite, 31 is prime.
31 is a prime number.
31 is prime.
31 is prime.
31 is a prime number
31, 47 and 103 are prime. The rest are composite.
is 2 prime composite or square
31 and 61 are prime, the rest composite.