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111 is composite.

If the sum of the digits in the number is divisible by 3, then the number itself is.

1+1+1 = 3, therefore 111 is divisible by 3.

111/3=37

37 is prime, so the prime factorisation of 111 is 3x37.

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11y ago
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Q: Is 111 a prime number Justify?
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