Solve the programming task below in a Python markdown code block.
Is every value in the array an array?

This should only test the second array dimension of the array. The values of the nested arrays don't have to be arrays. 

Examples:

```python
[[1],[2]] => true
['1','2'] => false
[{1:1},{2:2}] => false
```
Also feel free to reuse/extend the following starter code:
```python
def arr_check(arr):
```