im having problems and need help

Im having problems understanding this. Im running the while loop like it
says; and it doesnt complete the loop.
My question is, is it the formula thats wrong or my math. The % sign means
to square the number?
since i the to the second power is 64. Then it should return false. IDK
what I am doing wrong, if you could
help me understand where I am going wrong i would appreciate it thank you.

def is_power_of_two(number):
# This while loop checks if the "number" can be divided by two
# without leaving a remainder. How can you change the while loop to
# avoid a Python ZeroDivisionError?
while number % 2 == 0:
number = number / 2
# If after dividing by 2 "number" equals 1, then "number" is a power
# of 2.
if number == 1:
return True
return False

# Calls to the function
print(is_power_of_two(0)) # Should be False
print(is_power_of_two(1)) # Should be True
print(is_power_of_two(8)) # Should be True
print(is_power_of_two(9)) # Should be False
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