public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in); while (in.hasNext()) { getValue(in.nextInt());
        }
    } public static void getValue(int data) {
        String s = String.valueOf(data); int R = 1; for (int i = 0; i < s.length(); i++) {
            R = R * (s.charAt(i) - '0');
        } int r = (int) Math.sqrt((double) R); if (r * r == R) System.out.println("YES"); else System.out.println("NO");
    }
}