A

```
/**
* @author : dev-madhurendra<https://github.com/dev-madhurendra>
* Checks whether the given number is a power of four or not.
*
* A number is considered a power of four if and only if there is a single '1' bit in its binary representation,
* and that '1' bit is at the first position, followed by an even number of '0' bits.
*
* @param {number} n - The input number to check.
* @returns {boolean} True if the number is a power of four, false otherwise.
*
* @example
* const result = isPowerOfFour(16); // Returns true (16 is 4^2)
* const result2 = isPowerOfFour(5); // Returns false (5 is not a power of four)
*/
export const isPowerOfFour = (n: number): boolean =>
n > 0 && (n & (n - 1)) === 0 && n % 3 === 1
```