Hi,guys!

I was stuck on this exercise. The error message is :

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

Here is my code below. I am really confused about why it goes wrong when x = 9

Thanks for your advice:slight_smile:

```
def is_prime(x):
if x < 2:
return False
elif x == 2:
return True
else:
for n in range(2, x):
if x % n == 0:
return False
else:
return True
```