Three is prime. Twenty-seven is not (3 times 9 is 27).
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The prime factorization of 27 is: 3 x 9 3 x 3 x 3 The prime number that is a factor of 27 is 3.
The prime factorization of 27 is: 3 x 3 x 3
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.
29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!
The common prime factors of 27 and 117 are the prime numbers that can divide both 27 and 117 without leaving a remainder. The prime factorization of 27 is 3 x 3 x 3, and the prime factorization of 117 is 3 x 3 x 13. The only common prime factor between 27 and 117 is 3, as it is the only prime number that appears in the factorization of both numbers.