# Perfect Number

Posted: 31 Dec, 2020
Difficulty: Easy

## PROBLEM STATEMENT

#### You are given a positive integer K. Your task is to find out whether K is a perfect number or not.

##### Note :
``````Perfect numbers are those numbers that are equal to the sum of all its proper divisors.

Proper divisors are all the divisors of a number excluding the number itself.
``````
##### For example :
``````For K = 6, the proper divisors of 6 are 1, 2, 3 and its sum is 6 so 6 is a perfect number. For K = 8, the proper divisors of 8 are 1, 2,4 and its sum is 7 so 8 is not a perfect number.
``````
##### Input format :
``````The first line of input contains a single integer T, representing the number of test cases.

The first and the only line of each test case contains a single positive integer K, as described in the problem statement.
``````
##### Output Format :
``````For each test case, return true if K is a perfect number or else return false.
``````
##### Note :
``````You do not need to print anything. It has already been taken care of. Just implement the given function.
``````
##### Constraint :
``````1 <= T <= 100
2 <= K <= 10^8

Time Limit: 1 sec
``````
``````Can you do this in O(sqrt(N)) time and constant space?