of the following numbers , which one os prime : 14,13,21,23

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01-11-2016
Mathematics

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of the following numbers , which one os prime : 14,13,21,23

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notarobot notarobot · Answer 1 · 2016-11-01T18:36:57+01:00

notarobot notarobot

01-11-2016

Prime refers to numbers that cannot be divided by any number but themselves and 1.

14 can be eliminated, as it is even (no primes except 2 are even)
13 has no divisors. It is prime.
21 has 4 divisors. It is not prime.
23 has no divisors. It is also prime.

Two numbers of this list are prime; 13 and 23.

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