Python Program to Check Prime Number #short

Example to check whether an integer is a prime number or not using for loop and if...else statement. If the number is not prime, it's explained in output why it is not a prime number.

To understand this example, you should have the knowledge of the following Python programming topics:

Python if...else Statement
Python for Loop
Python break and continue

In this program, we have checked if num is prime or not. Numbers less than or equal to 1 are not prime numbers. Hence, we only proceed if the num is greater than 1.

We check if num is exactly divisible by any number from 2 to num - 1. If we find a factor in that range, the number is not prime, so we set flag to True and break out of the loop.

Outside the loop, we check if flag is True or False.

If it is True, num is not a prime number.
If it is False, num is a prime number.

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