A composite number is a positive integer that can be formed by multiplying two smaller positive integers, or in other words, a number that has at least one divisor other than 1 and itself. For example, 6 is a composite number because it is divisible by 1, 2, 3, and 6, while 19 is not a composite number because it is only divisible by 1 and 19. Composite numbers have more than two factors and are the opposite of prime numbers, which have only two factors. The smallest composite number is 4, and every composite number can be written as the product of two or more primes