program kiem_tra_so_chinh_phuong;
var
  n: integer;
  can_bac_hai: real;
begin
  write('Nhap vao mot so nguyen duong: ');
  readln(n);
  
  can_bac_hai := sqrt(n);
  if frac(can_bac_hai) = 0 then
    writeln('Yes')
  else
    writeln('No');
end.