2 is the only prime factor of 32
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A prime number is a number that has only 2 factors. That is, it can only divide by 1 and itself. 32 is even, and has the factors 1, 2, 4, 8, 16 and 32. Thus it is not a prime, but is a composite number.
The only prime factor of 32 is 2.
As a product of its prime factors: 3*3*5 = 45 or as 32*5 = 45
32 x 72 = 441
23 is a prim number, so only 1 can go into both 23 and 32.