A composite number is any number that is the product of two or more non-unit numbers. In this context we are usually talking about positive integers, but the term is more general than that.

Every number is one of:

A prime number;
A composite number;
A unit

(a number with a multiplicative inverse)

AutomaticLink Eratosthenes EuclideanAlgorithm Factorial FactoringIntegers FermatNumber FermatsLittleTheorem Goldbach PrimeNumberTheorem PrimePair RiemannHypothesis RiemannZetaFunction SieveOfEratosthenes TypesOfNumber	Euclid PerfectNumber			FermatPrime MarinMersenne
↓	↓		↓	↓
PrimeNumber			MersennePrime
			↓
		⇌	You are here CompositeNumber
			↓
			Integer
↓	↓		↓	↓
CountingNumber Divisor PrimePair WholeNumber	(none)			RealNumber

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Composite Number

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