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

Given an integer array nums and an integer k, return true if nums has a good subarray or false otherwise.
A good subarray is a subarray where:

its length is at least two, and
the sum of the elements of the subarray is a multiple of k.

Note that:

A subarray is a contiguous part of the array.
An integer x is a multiple of k if there exists an integer n such that x = n * k. 0 is always a multiple of k.

 
Please complete the following python code precisely:
```python
class Solution:
    def checkSubarraySum(self, nums: List[int], k: int) -> bool:
```