Prime Number Check in Python

Did you know?

A prime number is a number that has exactly two factors (1 and itself). Which means that a prime number can be divided evenly only by 1, or itself. A prime number must be a whole number greater than 1.

2, 3, 5, 7, 11, 13, 17… are all examples of prime numbers.

Your challenge:

Write a program that prompts the user to enter a number between 1 and 9999. The program will inform the end-user whether their number is a prime number or not.


In Python you can easily calculate the remainder of a division using the % sign.

For instance 7 % 2 would return 1.

So to check if a number “a” can be divided evenly by another number “b” you can check if the remainder of a/b is null using if a%b==0


So let’s look at the following code used to check if a number is a prime number or not.

Extended Challenges

  1. Tweak this code to display all the prime numbers between 1 and 9999.
  2. Write another program that takes a user input and find out if the number being entered is either odd or even.


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