Python to Check Whether Given Number is Fibonacci or Not

Python to Check Whether Given Number is Fibonacci or Not

To check whether a given number is Fibonacci or not in python; In this tutorial, how to check whether a given number is a Fibonacci number or not in python.

How to Check Whether a Number is Fibonacci or Not

# python program to check if given
# number is a Fibonacci number

import math

# function to check perferct square
def checkPerfectSquare(n):
    sqrt = int(math.sqrt(n))
    if pow(sqrt, 2) == n:
        return True
        return False

# function to check  Fibonacci number
def isFibonacciNumber(n):
    res1 = 5 * n * n + 4
    res2 = 5 * n * n - 4
    if checkPerfectSquare(res1) or checkPerfectSquare(res2):
        return True
        return False

# main code
num = int(input("Enter an integer number: "))

# checking
if isFibonacciNumber(num):
    print ("Yes,", num, "is a Fibonacci number")
    print ("No,", num, "is not a Fibonacci number")


Enter an integer number:  5 
Yes, 5 is a Fibonacci number 

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My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of I like writing tutorials and tips that can help other developers. I share tutorials of PHP, Python, Javascript, JQuery, Laravel, Livewire, Codeigniter, Node JS, Express JS, Vue JS, Angular JS, React Js, MySQL, MongoDB, REST APIs, Windows, Xampp, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL and Bootstrap from a starting stage. As well as demo example.

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