In this post, we will learn how to check if a number is a perfect square in Python with a very simple example and algorithm, but before we jump into the programming part, let’s see what is a perfect square.

## What is a Perfect Square?

A positive integer that is multiplied by itself and the resultant product is known as a perfect square.

For Example:

## Algorithm for Perfect Square

1. Take input from a user (`num`).
2. Create one variable called `flag` and initially set it to zero (`flag = 0`).
3. iterate through the loop from 1 to num (`for i in range(1, num+1)`).
4. inside the loop check `if i*i == num` then do step-5
5. increase the `flag` by 1 (`flag = 1`) and `break` the loop
6. Outside the loop check `if flag == 1` then print number is a perfect square.
7. `else` print number is not a perfect square

With the help of this algorithm, we will write the Python program to check if the number is a perfect square or not, but before writing this program few programming concepts you have to know:

### Source Code

``````num = int(input("Enter a Number: "))
flag = 0

for i in range(1, num+1):
if i*i == num:
flag = 1
break

if flag == 1:
print(f"{num} is a Perfect Square")
else:
print(f"{num} is not a Perfect Square")
``````

### Output

``````Enter a Number: 9
9 is a Perfect Square``````

You can also use the `sqrt()` function from the `math` module to write this program. Let’s see how.

## Python program to check if the number is a perfect square or not using the sqrt() function

Before writing this program you should know about:

1. math module (`sqrt()` function) &
2. if-else

### Source Code

``````import math
my_num = int(input("Enter A Number: "))
sq_root = int(math.sqrt(my_num))

if sq_root* sq_root == my_num:
print(f"{my_num} is a Perfect Square")
else:
print(f"{my_num} is not a Perfect Square")``````

### Output

``````Enter A Number: 100
100 is a Perfect Square`````` Hi, I'm Yagyavendra Tiwari, a computer engineer with a strong passion for programming. I'm excited to share my programming knowledge with everyone here and help educate others in this field. 