Prime Number Checker
About the Prime Number Checker
A prime number is a whole number greater than 1 that has only two divisors: 1 and itself. This calculator helps you instantly determine if any given number is prime, composite, or neither. It's a handy tool for students, teachers, and math enthusiasts.
How Prime Numbers Are Checked›
A number 'n' is prime if it is > 1 and not divisible by any number other than 1 and 'n'.
The calculator checks for factors from 2 up to the square root of the number. If no factors are found, the number is declared prime. Special cases like 0, 1, and negative numbers are handled separately.
Example:
Input: Enter a whole number: 29
Output: Result: 29 is a PRIME number! ✅
Steps to Use:
- Enter any whole number in the input field.
- Click the 'Calculate' button.
- The result will instantly show if the number is prime, composite, or neither.
Frequently Asked Questions
What is a prime number?›
A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. Its only factors are 1 and itself. Examples: 2, 3, 5, 7, 11.
What is a composite number?›
A composite number is a natural number greater than 1 that is not prime. It can be formed by multiplying two smaller natural numbers. Examples: 4, 6, 8, 9, 10.
Are 0 and 1 prime numbers?›
No. By definition, a prime number must be greater than 1. Therefore, 0 and 1 are special cases that are considered neither prime nor composite.
Is 2 a prime number?›
Yes, 2 is the first and only even prime number. All other even numbers are divisible by 2, making them composite.