There are many options:
2 rectangular prisms
2 cubes
2 parallelepipeds
2 tetrahedrons
2 square based pyramids
are some possibilities using convex polyhedra.
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There are six rectangles, consisting of three pairs of congruent rectangles.
A rectangular prism is the only shape that is made up from only rectangular faces. But there are countless shapes which contain rectangular faces along with other shapes.
Of rectangles and squares.
A rectangular prism has 6 flat surfaces
A rectangular prism that is 4 cubes by 2 cubes is made up of 8 cubes.