Which is not a prime number 19,29,39

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asked May 18, 2018 79.8k views

2 Answers

Vrushal Raut · Answer 1 · 2018-05-25T20:47:04+0000

Prime numbers are numbers that are only divisible by 1 and themselves. So, to tell if a number is prime, look at its factors.
19:
1 x 19
29:
1 x 29
39:
1 x 39
3 x 13
So, because 39 has more than one set of factors, it's NOT a prime number.

Which is not a prime number 19,29,39

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