Both 31 and 23 are prime numbers as they both can only be divided by 2 numbers themselves and 1
23, 29 and 31 are prime, the rest are composite.
23 and 31 are prime. 36, 62 and 87 are composite.
Composite. Its prime factors are 23 and 31.
Prime: 13, 23, 31 Composite: 15, 18, 51, 66, 81
23 and 31 are prime numbers whereas 52 33 60 and 25 are composite numbers.
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
Yes, those are prime numbers.
An integer greater than 1 can be composite or prime but not both. So 31 cannot be a composite prime.
51 is composite number
31 is PRIME.
31 is prime.
23 is prime, 66 is composite.