
Related:
 free online prime factorization calculator
 prime factorization lesson
 Seive of Erasthenes
 prime factors list (generates list of primes up to any number)
 prime and perfect numbers
 prime factorization resources
 composite number
A composite number is a positive integer that has a factor other than 1 and itself. For instance, 6 is a composite number because:
 it is positive
 it has a factor other than 1 and itself (both 2 and 3 are factors of 6)
If you are familiar with prime numbers, then you should recognize that a positive integer is either prime or compositethese two terms are mutually exclusive.
Examples of Composite Numbers
 4
 4 is composite because 2 is a factor
 8
 8 is a composite number because it has 4 and 2 as factors
non examples of Composite Numbers
 5
 5 is a not a composite number because its only factors are 1 and itself (5). 5 is, however, a prime number.
 2
 2 is a not a composite number because its only factors are 1 and itself (2). 2 is, however, a prime number . 2 is also the even number that is not composite. Every other even number is indeed a composite number.
 7
 7 is a not a composite number because its only factors are 1 and itself (7). 7 is, however, a prime number.