You cannot make a solid shape with 5 rectangular sides. You can make an open rectangular box, leaving off the last side.
You can make a rectangular box (like a cube, but with possibly unequal sides) with 6 rectangles. You can make a rectangular pyramid with one rectangle and four triangles.
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You can make about 5
A rectangular prism.
A rectangular prism.
A pentagonal prism.
It is called a pyramid.