Prime Numbers

package interview;

public class Prime {

public static void main(String[] args)
{
  boolean flag = false;
  int num = 127;
  for(int i = 2;i<Math.sqrt(num)+1;i++)
  {
  if(num%i == 0)
  {
   flag = true;
  }
  }
         System.out.println(flag ==  true ? Not Prime : Prime);

}

}