Is 109 a prime number?

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Answer 1 · 2016-05-21T10:58:30

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Answer 2 · 2016-05-21T12:56:30

$109$ is a prime number.

To test whether a number is prime number or not

one need to try dividing the number only by prime numbers up to approximately square root of this number

Here we have to identify whether $109$ is a prime number or not.

Hence we have to try only by prime numbers up to $10$ (as $10^2=100)$ i.e. by ${2,3,5,7}$

As $109$ is not divisible by any of these numbers, $109$ is a prime number.