They are all positive integers with more than two factors.
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They have more than two factors.
Composite numbers have one or more factors that are not 1 and itself.
Any two composite numbers who do not share the same prime factors.15 = 5x322 = 11x2So 15 and 22 have a GCF of 1
Positive integers with only two factors.
Rectangular numbers are a subset of composite numbers. The squares of prime numbers will be composite but not rectangular.