Next
1. Grade Calculator2. Vowel or Consonant3. Character Classification (Digit / Alpha / Special)4. Check Eligibility to Vote5. Check Divisible by 5 and 116. Check Armstrong Number7. Check Perfect Square8. Triangle Type Check9. Check Strong Number10. Check Perfect Number11. Check Automorphic Number12. Check Harshad Number13. Check Abundant Number14. Check Friendly Pair15. Compare Floating Numbers16. Menu-Driven Calculator17. Bill Discount System18. Login Authentication19. Validate Password Strength20. Validate Email Format

Check Perfect Square in Python

Check whether a number is a perfect square.

BeginnerConditional ProgramsExample 7 of 20
check-perfect-square.py
1# Program to check if a number is a perfect square
2

3import math
4

5num = int(input("Enter a non-negative integer: "))
6

7if num < 0:
8    print("Negative numbers cannot be perfect squares in real numbers.")
9else:
10    root = int(math.sqrt(num))
11    if root * root == num:
12        print(num, "is a perfect square")
13    else:
14        print(num, "is not a perfect square")

Output

Enter a non-negative integer: 16
16 is a perfect square

What's going on

We take the integer square root and square it back.

If root * root equals the original number, it is a perfect square.

After this program

If the idea is still fuzzy, read Day 8: Conditional Statements in the Python course. For a short check, try the Python quiz (300 questions). Stay with all 20 conditional programs, or see every topic on Python exercises.

PreviousCheck Armstrong NumberNextTriangle Type Check