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Q: Which number is not a prime number 17 39 23 31?

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

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

51 is not a prime number: 3x17=51

51 is composite number

17, 31 and 23 are.

51 = 3 x 17

17, 19, 23, 29, and 31

17, 19, 23, 29, 31.

39 is not prime because 13 and 3 are factors of it. To be prime the number cannot have any factors except itself and 1.

No, 12121 is composite. Its prime factors are: 31 x 23 x 17 = 12121

7 11 13 17 19 23 29.

There are an infinite number of prime numbers after 11, starting with 13, 17, 19, 23, 29, 31, etc.

19 23 29 31 37 41 43 47 53 59

prime numbers above 13 = 17, 19, 23, 29, 31,...

Composite. Its prime factors are 23 and 31.

It is: 51 because it has more than two factors and so therefore it is a composite number

19 23 29 31 and so on. All prime numbers

A number that only has two factors being one and itself are the prime numbers. Some are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47. There are many prime numbers

31 = 31 is a prime number 34 = 2 x 17

104

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

29

29

That depends on the month and whether or not it is a leap year but the prime numbers from 2 to 31 are: 2 3 5 7 11 13 17 19 23 29 and 31

27