JAVA Program to determine whether a number is prime or not

import java.util.Scanner;
class Prime_number 

{
  public static void main(String[] args) 

  {
    Scanner s = new Scanner( System.in );
    System.out.print( "Enter the number : " );
    int num = s.nextInt();
    int i;
    for (i=2; i < num ;i++ )

    {
      int n = num%i;
      if (n==0)

      {
        System.out.println("not Prime!");
        break;
      }
    }
    if(i == num)

    {
      System.out.println("Prime number!");
    }
  }
}