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Q: Which is not a prime number 13 15 17 19?

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Number 17 is but 15 isn't as 5x3 isn't a prime number

17

The whole number between 13 and 17 is 15

It is 13: 2, 3, 5, 7, 11, 13, 17 . . .

17

13

17.

13

If you mean: 12 13 15 17 27 and 29 then the prime numbers are 13 17 and 29

It is 17.

17

Even number bigger than two are never prime so cross them out, leaving11,13,15,17,19Any number ending in 5 is divisible by 5 and so can not be prime,This leaves 11,13,17,19 which all could be prime and actually are.

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