# Prime Number Calculator

**Why use an online prime number calculator?**

You can easily find out whether a number is a prime number or a composite number using Mycalcuâ€™s **prime number calculator.**

Whether the number is prime or composite, this calculator also finds all the possible factors of both the prime number and composite number.

You will be able to test for a prime number for any whole number or integer far more quickly and accurately than ever.

**How does it work?**

A prime number is any whole number or integer that has two factors only and if there is any integer or whole number that has more than two factors it is a composite number.

For example, 2 is a prime number since it has two factors (1, 2). While 51 is a composite number since it has 4 factors (1, 3, 17, 51).

**How to use a prime number calculator?**

Enter any integer or whole number that you want to test whether it is a prime number or not and click calculate.

Is 1 A Prime

Is 2 A Prime

Is 3 A Prime

Is 4 A Prime

Is 5 A Prime

Is 10 A Prime

Is 20 A Prime

Is 30 A Prime

Is 40 A Prime

Is 50 A Prime

Is 100 A Prime

Is 200 A Prime

Is 500 A Prime

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Is 1000 A Prime

Is 2000 A Prime

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Is 5000 A Prime

Is 10000 A Prime

Is 20000 A Prime