Simple Java program to find Prime number

This program has made simple for better understanding of beginners.

import java.util.Scanner;

public class PrimeNumber {

public static void main(String args[]){

System.out.println("Enter the number: ");

//To receive input from users

Scanner s = new Scanner(System.in);

int num = s.nextInt();

s.close();

//Logic to detect the prime number

for(int i=2; i<num; i++){

int temp = num%i;

if (temp == 0){

System.out.println("This is not a prime number.");

break;

} 

else{

if (i == (num-1)){

System.out.println("This is a prime number.");

}

}

} 

}

}

Output:

Enter the number: 

21

This is not a prime number.

Enter the number: 

3

This is a prime number.