Python – Check if a number is prime

In this post, we will see how we can check if a number is prime or not


A number is prime, if it has NO divisors other than 1 or itself [in other words, it should not be divisible by any number in between 1 and itself]


5 => is a prime number [5 is not divisible by any number in between 1 and 5, i.e not divisible by 2/3/4]

9 => is NOT a prime number [9 is divisible by 3]


num // 2 => divide with 2 (discard remainder)

Used num // 2 => we are checking divisibility half way of the number [no need to check full range]

If interested the implementation in java, refer here

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