Prime Numbers are natural numbers greater than 1 that are not a product of two smaller natural numbers. The first few prime numbers are 2, 3, 5, 7, 11, 13, ... Composite Numbers are natural numbers greater than 1 that are not prime numbers. Composite numbers can be expressed as a product of prime numbers. The first few composite numbers are 4, 6, 8, 9, 10, 12, ... Neither Prime nor Composite Numbers are also known as