A Prime number is a number that is divisible only by 1 and itself; it has no other factors.
The factors of 7 are 1 and 7.
The factors of 13 are 1 and 13.
The factors of 27 are 1, 3, 9, and 27.
The factors of 29 are 1 and 29.
Therefore, 27 is the only one that is not a prime number.
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27 is not a prime number.
27 is not prime number because it has more than two factors. Factors of 27 are 1, 3, 9 and 27.
The answer is 29.
27
29