I dont know whats wrong with my code I've tried a few different methods and I still get stuck on 9


#1



6.is_prime


Oops, try again. Your function fails on is_prime(9). It returns True when it should return False.


import math
def is_prime(x):
    if x<2:
       return False
    elif x==2:
        return True  
    elif x % 2*math.sqrt(x) == 0:
        return False 
    else:
        return True


#2

What you've got right now does three comparisons, is that really enough to determine if any number is prime?

What do you have to do to manually determine if a value is prime? Your code would have to do the same things, wouldn't it?


#3

I not sure I understand the math please enlighten me


#4

Searching for information like this needs to become second nature to you, it is but a google search away.
This explains one way to determine whether a number is prime, it is essentially saying the same thing that the exercise instructions already do https://en.wikipedia.org/wiki/Prime_number#Trial_division


#5

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