2,4,6,8,9,12,18, 24,36,72
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composite
86 is composite, because it has factors other than 1 and itself. The factors of 86 are 1, 2, 43, and 86. All even numbers greater than 2 are composite.
The factors of 21 are 1, 3, 7, and 21 which means that 21 is composite.
Zero is composite because it has all the real numbers as factors.