1 is a prime number if the only numbers that divide it are 1 and p.A natural number p1 is a prime number if the only numbers that divide it are 1 and p.
A natural number is a composite number if it is not prime.
The first ten prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29. Notice that 2 is the only even prime number; all other even numbers are composite.