You are given a positive integer n. Your task is to determine whether it is an Armstrong number. A number is an Armstrong number if it equals the sum of each of its digits raised to the power of the total number of digits.
Input: n = 153
Output: Yes
Explanation: The number 153 has three digits, and 1³ + 5³ + 3³ = 153. Therefore, it is an Armstrong number.
Input: n = 123
Output: No
Explanation: The number 123 has three digits, but 1³ + 2³ + 3³ = 36, which is not equal to 123.
Input: n = 9474
Output: Yes
Explanation: The number 9474 has four digits, and 9⁴ + 4⁴ + 7⁴ + 4⁴ = 9474. Therefore, it is an Armstrong number.
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