java program for prime checking

/*Prime checking using java through keyboard input
  By sanjay kumar singh,ggsestc*/


import java.io.*;
import java.lang.*;
class prime5
{
    public static void main(String args[]) throws IOException
    {
      DataInputStream in=new DataInputStream(System.in);
      int no;
      System.out.println("Enter any number:");
      no=Integer.parseInt(in.readLine());
      for(int c=2;c<=Math.sqrt(no);c++)
       {
           if(no%c==0)
           {
             System.out.println("number is not prime");
             System.exit(0);
           }
           else
           System.out.println("number is prime");
      }
  }
}

----output----