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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