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Definition

Composite Number

A composite number is a counting number that is not prime — it has at least one factor besides 11 and itself. For example, 44 is composite because its factors include 1,2,1, 2, and 44; and 1212 is composite because its factors are 1,2,3,4,6,1, 2, 3, 4, 6, and 1212. Every counting number greater than 11 falls into exactly one of two categories: prime or composite. The number 11 is neither prime nor composite.

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Updated 2026-04-21

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