This is a little odd, but:
All squares are rectangles, but rectangles are never squares.
8
They are both 3 dimensional shapes having surface area and volume.
Put all the cubes in a line.
Cubes are a specific type of rectangular prism where all six faces are squares of equal size, meaning all edges have the same length. In contrast, rectangular prisms can have faces that are rectangles of varying dimensions, allowing for a wider range of shapes. While both share the same general properties of having length, width, and height, the uniformity of a cube sets it apart from other rectangular prisms. Thus, all cubes are rectangular prisms, but not all rectangular prisms are cubes.
8, one for each corner; all cubes are rectangular.
NO
All of them are.
The reason for prisims is... think about it! Would it be easy to stack spheres?
Yes; just as all squares are rectangles, all cubes are rectangular prisms.
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.
Cubes have a square on each side, but rectangular prisms have rectangles or squares.
There is no limit to the number of cubes which can be arranged on top of a rectangular prism.