Composite numbers less than 20 are 4, 6, 8, 9, 10, 12, 14, 15, 16 and 18.
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18 and 20
Prime numbers have two factors, composite numbers have more than two.
Prime numbers have two factors; composite numbers have more than two.
Prime numbers have two factors. Composite have more than two. Neither (one and zero) have less than two.
Composite numbers are integers that have more than two factors.