Please solve the programming task below using a self-contained code snippet in a markdown code block.

Given an array of integers nums and a positive integer k, check whether it is possible to divide this array into sets of k consecutive numbers.
Return true if it is possible. Otherwise, return false.
 
Please complete the following python code precisely:
```python
class Solution:
    def isPossibleDivide(self, nums: List[int], k: int) -> bool:
```