Perfect Number

{8}Perfect Number
A perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. A divisor of an integer x is an integer that can divide x evenly.
Given an integer n, return true if n is a perfect number, otherwise return false.
Example 1:

Input: num = 28
Output: true
Explanation: 28 = 1 + 2 + 4 + 7 + 14
1, 2, 4, 7, and 14 are all divisors of 28.
Example 2:

Input: num = 7
Output: false

class Solution {
    public boolean checkPerfectNumber(int num) {
        if (num == 1)
        {
            return false;
        }
        int sum = 0;
        for (int i = 2; i <= Math.sqrt(num); i++)
         {
            if (num % i == 0) {
                sum =sum+i;
                if (i != num / i) sum += num / i;
            }
        }
        sum++;
        
        return sum == num;
    }
}