# Is there any process to determine that a number given is prime number or not?

##### 1 Answer
Jun 24, 2016

The simplest process is to check its divisibility by all numbers that are upto roughly its square root.

#### Explanation:

A very primitive and straightforward process to check if number $N$ is prime is to check its divisibility by $2$, $3$, $4$... up to $\sqrt{N}$.