51 composite, 61 prime.
51 is composite.
The number 51 is a composite number because it has factors other than 1 and itself. Specifically, 51 can be divided evenly by 1, 3, 17, and 51. In contrast, prime numbers are only divisible by 1 and themselves.
51 is composite, 103 is prime.
prime
prime
It is composite.
composite
It is composite.
51 is a composite number but 61 is a prime number
24 and 51 are composite, 3 is prime.
51 is divisible by 3, therefor it is composite. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1, 2, and 0. 1, 2, and 0 have a different name.