2 x 2 x 3 x 3
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2 x 2 x 3 x 3 = 36
Prime numbers are only divisible by themselves and 1. 36 can be divided by 2, 3, 4, 6, 12 and 18 and is not a prime number.
2x2x2x2=16
40 & 4
-- List all the divisors (factors) of 36. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36 . -- Check over the list, and mark all the ones that are prime numbers. There are only two of them, so I'll let you handle that part.