Write a Python function `is_not_prime(n)` that determines whether a given integer `n` is not a prime number. A prime number is a number greater than 1 that has no divisors other than 1 and itself. If the number is not prime, the function should return `True`; otherwise, it should return `False`.
#### Example Usage:
```python [main.nopy]
is_not_prime(2) # False, because 2 is a prime number
is_not_prime(10) # True, because 10 is not a prime number
is_not_prime(35) # True, because 35 is not a prime number
is_not_prime(37) # False, because 37 is a prime number
```
#### Constraints:
- The input `n` will be a positive integer greater than or equal to 2.