2023-12-26-check-if-number-is-prime.md

layout	title	author	categories	toc	description
post	Java Program To Check If The Given Number is Prime or Not	gaurav	Java Programs Core Java	true	In this tutorial, we will see a Java program to check if the given number is Prime or Not.

In this tutorial, we will see a Java program to check if the given number is prime or not.

What is a Prime Number?

A number that can be divided exactly only by itself and 1.

For example 7, 17 and 41.

Java Program To Check If The Given Number is Binary Or Not

public class PrimeNumber {

    public static void main(String[] args) {
        int num = 41;
        boolean isPrimeNumber = isPrime(num);
        if (isPrimeNumber) {
            System.out.println(num + " is a prime number.");
        } else {
            System.out.println(num + " is not a prime number.");
        }
    }

    public static boolean isPrime(int num) {
        if (num <= 1) {
            return false;
        }
        for (int i = 2; i <= Math.sqrt(num); i++) {
            if (num % i == 0) {
                return false;
            }
        }
        return true;
    }
}

Output

41 is a prime number.