31 is a Prime number. It has no positive integer factors apart from itself and 1.
93 is composite.
63 is composite.
31 is prime.
31 is prime.
51 is composite.
93 is composite.
63 is composite.
39 is a composite number 1 is neither prime nor composite number 31 and 41 are prime numbers.
31 is prime.
Composite. Its prime factors are 23 and 31.
No, it is a prime number.
31 and 61 are prime, the rest composite.
31 is prime.
31 is prime.
31 is a prime number
It is a prime.
91 is composite.