function ExtentOfTwo (number){
  function isDigit(str){
    return str && !/[^\d]/.test(str);
  };
  if(isDigit(number) === false | number < 0 | Math.round(number) != number){
    return false;
  };
  while(number != 2){
    if(number % 2 != 0){
      return false;
      break;
    };
    number = number / 2;
  };
  return true;
};