As the definition of a Prime number is 'a number that can only be divided by one or itself, and still leave a whole number.' Anything in the eight times table would be divisible by two and four. 27 can also be divided by both three and nine.
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29 is the next prime number after 27. But 27 is not a prime! 3 x 9 = 27!
It can be. 27 is relatively prime to 28.
prime factoring for 27 is 3 x 9.
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.