# Prime Number Calculator

Cuemath's online calculator helps you to identify a prime number

## What Is a Prime Number Calculator?

A prime number calculator is a free online tool that calculates and tells if a given number is a prime number or not.

Cuemath's online calculator helps you to identify a prime number within a few seconds.

## How to Use the Prime Number Calculator?

Follow the steps given below to use the calculator:

**Step 1:**Enter any number in the input box.**Step 2:**Click on**"Go"**to know whether the number entered is a prime number or not.**Step 3:**Click on**"Reset"**to clear the field and enter the new number.

## How to Find Prime Numbers?

Any whole number greater than 1 is either a prime number or a composite number. If the number has exactly two factors, 1 and itself, it is defined as a prime number.

Follow these steps to find out if the number is prime or not:

- Write all the factors of the given number.
- Count the factors.
- If the number of factors are 2 (1 and the number itself), then the given number is prime.
- If the number of factors are more than 2, then the given number is NOT prime (in that case, it is called a composite number).

**Solved Example:**

Is 11 a prime number?

**Solution:**

The number 11 has only two factors, 1 and 11

Therefore, 11 is a prime number.

Similarly,

- 13 is a prime number
- 29 is a prime number

Now, you can use the calculator and check if the following numbers are prime or not:

- 8
- 17
- 40

Calculators

Math Formulas

Questions