Prime / Composite

PrimeOrComposite website helps to find out the number is prime number or composite number.

Type your number to check prime or composite.

Prime Check

In prime number theory, the prime factors of a positive integer are the prime numbers that divide that integer exactly. Number should have exactly two factors to be classified as a Prime number.

Composite Check

Composite numbers are whole numbers that have at least three factors. A composite number has more than two factors.All the composite numbers are 'made up' of prime numbers that are multiplied together.

1 To 1000 Number Prime Or Composite Check

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What Is Prime Number ?

Prime numbers are positive integers which have no divisors other than 1 and themselves so prime numbers can't be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17, 19, 23.... are the prime numbers.

How to check if a number is prime ?

The method we use is to try to divide it by all numbers from 1 to itself.

For example:

Let's check 42 prime or not ?

For number 42 we have to divide from 1 to 42 to find the remainder is equal to 0.

Divisors are : 1 , 2 , 3 , 6 , 7 , 14 and 21. So there more than 2 divisors.

The Answer : 42 is not a prime number.

Another example:

Let's check 17 prime or not ?

For number 17 we have to divide from 1 to 17 to find the remainder is equal to 0.

1 and 17 are the only divisors for 17. There are 2 divisors.

The Answer : 17 is a prime number.

Type your number to check prime or not.

Prime Number Check Between 1 and 1000

Prime or composite

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