Prime Number Calculator Online – Check Prime & Composite Numbers Instantly
Check Prime Numbers Online with a Prime Number Calculator
A prime number calculator is a simple yet powerful online tool that helps you determine whether a given number is a prime number or not. A prime number is defined as a natural number that is divisible only by 1 and itself. This calculator allows you to instantly verify numbers without performing manual division or complex calculations.
To use the calculator, simply enter the number you want to check and click the Calculate button. Within seconds, the tool will display whether the number is prime or composite.
Prime Number Calculator
Enter a number to check if it’s a Prime Number or not.
What Is a Prime Number?
Prime numbers are natural numbers greater than 1 that have exactly two factors:
- 1
- The number itself
Examples of prime numbers include:
- 2
- 3
- 5
- 7
- 11
- 17
These numbers cannot be divided evenly by any other natural number.
What Are Composite Numbers?
A composite number is a natural number that has more than two factors. In other words, it can be divided by numbers other than 1 and itself.
Examples of composite numbers:
- 4 (1, 2, 4)
- 6 (1, 2, 3, 6)
- 24 (1, 2, 3, 4, 6, 8, 12, 24)
The prime number calculator not only identifies prime numbers but also tells you when a number is composite.
How the Prime Number Calculator Works
The calculator works in a very straightforward way:
- Enter any natural number
- Click the Calculate or Submit button
- Instantly view the result
The tool checks all possible divisors of the entered number and determines whether it meets the criteria of a prime number.
Examples of Prime Number Checking
Example 1
Is 2 a prime number?
Yes. It is divisible only by 1 and 2, so it is a prime number.
Example 2
Is 17 a prime number?
Yes. It has no divisors other than 1 and 17.
Example 3
Is 24 a prime number?
No. Since 24 is divisible by numbers like 2, 3, 4, and 6, it is a composite number.
Numbers That Are Neither Prime Nor Composite
Some numbers do not fall into either category:
- 0 is neither prime nor composite
- 1 is neither prime nor composite
Additionally, prime numbers must always be positive natural numbers greater than 1. Negative numbers can never be prime.
Why Use an Online Prime Number Calculator?
- Saves time and effort
- Eliminates manual checking
- Accurate and instant results
- Useful for students, teachers, and exam preparation
- Works on all devices
This online prime number calculator is an easy and reliable way to understand number classification and quickly verify whether a number is prime or composite.