You are given a positive integer n. Your task is to determine whether it is a Strong number. A number is Strong if it equals the sum of the factorials of its digits.
Input: n = 145
Output: Yes
Explanation: The sum of the factorials of the digits is 1! + 4! + 5! = 1 + 24 + 120 = 145. Therefore, 145 is a Strong number.
Input: n = 123
Output: No
Explanation: The sum of the factorials of the digits is 1! + 2! + 3! = 1 + 2 + 6 = 9, which is not equal to 123.
Input: n = 2
Output: Yes
Explanation: The only digit is 2, and 2! = 2. Therefore, 2 is a Strong number.
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