Square
No, in general they are six rectangles. Only in special cases would they be squares.
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A rectangular prism.
A triangular prism has two triangular faces, a rectangular prism does not have any.
A rectangular prism
A rectangular prism does not need to have any square faces. All its faces may be rectangular in shape. However, it may also have two or four square faces, yet still be a rectangular prism.
A rectangular prism.... has four rectangular, and two square faces.