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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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16y ago

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