In this tutorial, we will write a program to check whether the number is prime or not in java. Before that, you should have knowledge on the following topic in java.

## Prime Number

A number is said to be a prime number if it is divisible by **itself** and **1**. **Example: **3, 5, 7, 11, 13, 17, 19, etc.

**Explanation**:

We take a *boolean variable* *isPrime* and assigned it to be true. Then we take the user input and start a * for loop* for i = 2 end the loop for

*i*less than half of the number entered.

*i*will increase by 1 after each iteration.

Inside for loop, a *temp *variable will contain the remainder of each iteration. And then *if statement* will check for temp to be 0 that is if the remainder is zero, *isPrime* is set to false. If isPrime is true, the number is Prime number else not.

**Java Program to check whether a Number is Prime or Not**

source code: Java Program to check for the prime number.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 | //check for the prime Number import java.util.Scanner; public class PrimrNumberCheck { public static void main(String args[]) { int temp; boolean isPrime = true; Scanner scan = new Scanner(System.in); System.out.print("Enter any number: "); int num = scan.nextInt(); scan.close(); for (int i = 2; i <= num / 2; i++) { temp = num % i; if (temp == 0) { isPrime = false; break; } } if (isPrime) System.out.println(num + " is a Prime Number"); //If isPrime is true else System.out.println(num + " is not a Prime Number"); //If isPrime is false } } |

**Output:**

`Enter any number: 13 `

13 is a Prime Number