2 x 2 x 2 x 2 x 2 = 32
7 x 7 = 49
3 x 3 x 7 = 63
2 x 2 x 5 x 5 = 100
49 has the fewest prime factors. 32 and 49 have the fewest distinct prime factors.
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The only prime factor of 32 is 2.
2 is the only prime factor of 32
The square of any prime number has exactly three factors: 22, 32, 52, etc.
The prime factors of 32 are 2*2*2*2*2 or 25 The prime factors of 56 are 2*2*2*7 or 23*7 So 2 is the answer.
prime factors of 18 are 2 and 32 prime factors of 24 are 23 and 3 prime factors of 42 are 2, 3 and 7 LCM = 23*32*7 = 504