Hey, Today we will learn how to check the number is prime or not. First of all we need to know what is a prime number ? The simplest answer is the number can divide by 1 and the number itself then it’s a prime number , Example 1 and 7. here divide means no reminder value. so for 7 we can divide this number with 1 and 7 only . other number also can divide but there will be reminder value. So let’s check the program.

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package practice.house.com; import java.util.Scanner; public class PrimeNumber { public static void main(String args[]) { int n, i, res; boolean flag = true; Scanner sc = new Scanner(System.in); System.out.println("Please Enter a No."); n = sc.nextInt(); for (i = 2; i <= n / 2; i++) { res = n % i; if (res == 0) { flag = false; break; } } if (flag) System.out.println(n + " is Prime Number"); else System.out.println(n + " is not Prime Number"); } } |

OUTPUT:

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Please Enter a No. 7 7 is Prime Number ------ ***** ----- Please Enter a No. 9 9 is not Prime Number |

here in the output you can see that 9 is not a prime number because 9 can divide by 3 with a reminder 0. So number 9 can divide by 1,3,9 So it’s not a prime number.

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