Oops, try again. Does your is_prime function take exactly one argument (an integer)? Your code threw a "'int' object is not iterable" error.

```
def is_prime (x):
for n in x:
n <= (x-1)
n >= 2
if x % n == 0:
return False
else:
return True
```

Why does this code not work?Can someone explain it?