7 is prime.
prime
It is a prime number
The Number 7 is a prime number
Prime
8 is a composite number but 7 is a prime number
7 is an odd prime number.
7 is prime
287 is not prime. 287 = 7 * 41287 is a composite number.
prime
prime
343 is not prime. 343 = 7 * 7 * 7