#### 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.

#### Hint:

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

#### Solution

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

#### Extended Challenges

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

#### Solution...

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