package acm;
import java.io.*;
import java.util.*;

public class Light {
    public static void main(String[] args) throws IOException {
        ArrayList<String> userInput = new ArrayList<String>();
        BufferedReader bs = new BufferedReader(new InputStreamReader(
                System.in));
        String input = bs.readLine();
        while (!input.equalsIgnoreCase("0")) {
                userInput.add(input);
                input = bs.readLine();
        }
        Iterator it = userInput.iterator();
        while (it.hasNext()) {
            String numbers = (String) (it.next());
            squareRoot(numbers);
        }
    }

    public static void squareRoot(String s) {
        double db=Math.sqrt(Double.parseDouble(s));
        if(db!=Math.ceil(db)){
            System.out.println("no");
        }else{
            System.out.println("yes");
        }
    }
}