Power of leetcode 231.2

Give you an integer n, Please judge whether the integer is 2 Power square . If it is , return true ; otherwise , return false .

If there is an integer x bring n == 2x , Think n yes 2 Power square .

Example 1：

 Input ：n = 1
 Output ：true
 explain ：20 = 1

Example 2：

 Input ：n = 16
 Output ：true
 explain ：24 = 16

Example 3：