Q: Which number is not a prime number 23 27 31 47?

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27

27 and 31 are prime.

17, 23 and 31 are prime. 39 is not.

17, 23 and 31 are prime. 39 is not.

Composite. Its prime factors are 23 and 31.

29

29

17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..

39

51 is not a prime number: 3x17=51

41

51 is composite number

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Which number is not a prime number 23 27 31 47?

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