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72 is divisible by 6. (72 / 6 = 12) Hence 6 is a composite number of 72.
72
24, 51 and 72 are composite numbers 71 is a prime number.
The composite factors of 72 are 4, 6, 8, 9, 12, 18, 24, 36, 72
72 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.