[Python] To find if a number is fibonacci or not

I am a student, new to python. I am trying to code a program that will tell if a user input number is fibonacci or not.

num=int(input("Enter the number you want to check\n"))
temp=1
k=0
a=0
summ=0
while summ<=num:
summ=temp+k
temp=summ
k=temp
if summ==num:
a=a+1
print("Yes. {} is a fibonnaci number".format(num))
break
if a==0:
print("No. {} is NOT a fibonacci number".format(num))
#The program is working for only numbers upto 2.

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