An automorphic number is a number whose square ends with the number itself. For example, 5 is automorphic because 5 squared is 25, which ends with 5. Similarly, 76 is automorphic because 76 squared is 5776, which ends with 76. Given an integer, determine if it is an automorphic number. Return false for null or negative input.
Examples:
Input: num = 5
Output: true
Explanation: 5 * 5 = 25, which ends with 5
Input: num = 76
Output: true
Explanation: 76 * 76 = 5776, which ends with 76
Input: num = 7
Output: false
Explanation: 7 * 7 = 49, which does not end with 7
Input: num = 0
Output: true
Explanation: 0 * 0 = 0, which ends with 0
Input: num = null
Output: false
Explanation: Null input returns false
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