Prime or not of accepted number

// Write a program to accept
// a number from command line
// arguments. Then decide
// the number is a prime or not
class prime
{
  public static void main(String args[])
  {
    int a,i;
    if(args.length==1)
    {
        a=Integer.parseInt(args[0]);
        for(i=2 ; i<=a ; i++ )
           if(a%i==0) break;
        if(a==i)
           System.out.println("Prime number");
        else
           System.out.println("Not Prime number");
    }
    else
        System.out.println("java prime ##");
  }
}