because every square is a rectangle.
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A rectangular cube (a cuboid) is a kind of prism and, by convention, prisms have two bases.
Well, honey, a cube is a special kind of rectangular prism where all sides are the same length, so they both have six faces, eight vertices, and twelve edges. It's like saying a square is a rectangle, but a rectangle isn't always a square. So, technically, a cube is just a snazzy rectangular prism showing off its symmetry.
trinangleular prism
The flat surfaces of all polyhedra are called faces and a rectangular prism is simply one kind of polyhedron.
A cube is a special kind of hexahedron.