class Solution {

public:

bool checkPerfectNumber(int num) {

if (num <= 1)

return false;

```
int sum = 1;
for (int i = 2; i * i <= num; i++)
{
if (num % i == 0)
{
sum += i;
if (i * i != num)
sum += num / i;
}
}
return sum == num;
}
```

};