"Oops, try again. Your function fails on is_prime(1). It returns None when it should return False."

I am really confused on what I'm supposed to do.

```
Replace this line with your code.
def is_prime(x):
if x==0 and x<2:
return False
elif x>=2:
return True
else:
for n in range (2, x):
if x%n==0 and x%1==n:
return False
else:
return True
```