2 x 2 x 2 x 3 x 3 = 72
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It is: 2 to the power of 12 = 4096
6 is not a prime number but it is a factor of 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. 2 is prime, 72 is composite.
24, 51 and 72 are composite numbers 71 is a prime number.