I do not believe that such a shape is possible. At least, not without going into exotic geometries.
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it has four rectangular sides and 2 square faces * * * * * It need not have ANY square faces. It can have six rectangular faces.
There are many plane shapes comprising 4 squares and 2 rectangles but there is no such 3-dimensional shape.
square
a square is the answer.
A square has 2 parallel sides!! You dumb dumb!