2 and 3
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As a product of its prime factors: 2*2*3 = 12
The factors of 12 are 1, 2, 3, 4 ,6, 12. Since 12 has more than two factors it is composite, not prime.
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.
6
24 is a prime number if it has factors of only 1 and 24. In this case, 24 is NOT a prime number since its factors are (2, 12), (3, 8), (4, 6).