composite number

noun1

1. •
   A (nonzero) natural number that is expressible as the product of two (or more) natural numbers other than itself and 1.

   • It is evident, moreover, that if a composite number terminates in any one of the digits 1, 3, 7, 9, no one of its factors can be the number 5, or any number ending in 5. — 1853