4, 6, 8, 9, 12, 18, 24, 36, 72
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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.
4, 6, 8, 9, 12, 18, 24, 36, 72
By multiplying some of the prime numbers together.
Ok, so "72" is a composite number, because it has factory. See, the factors of "72" are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and then of course itself: 72. A prime number's factors are only 1 and itself, so for example 7. A factor is any whole number that, when multiplied by any one other whole number, is that number that the original number was and is a factor of. Hope this helps!
72 is divisible by 6. (72 / 6 = 12) Hence 6 is a composite number of 72.