12 = 2 * 2 * 3
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The prime factors of 12 are 2 and 3. The only prime factor of 27 is 3. The prime number that both 12 and 27 have as a factor is 3.
It depends how its used. 3 is a prime number. 3 is a prime factor of 12.
2 is the smallest prime factor of 12.
12 6,2 3,2,2
3