Squares are actually also rectangles so you could make 8 rectangles without touching any of the squares. However, if you could cut the squares, that would be a different problem....
You need 4 rectangles and two squares * * * * * No, you do not need to have squares: there can be six rectangles - as in a brick shape.
8
Six - although two of them could be squares.
9 (six rectangles = three squares)
It has six rectangular faces although two of these could be squares.
cube's are consisted of squares, so none.but it takes 6 squares to make up a cube.
Rectangles and squares both have 4 corners.
96 rectangles.
Using all 13 squares, and not counting different orientations, only one.
Assuming the 12 squares are the same size, three. And three more if you count different orientations (swapping length and breadth) as different rectangles.
As many as you want.