There are 6. Each side is a flat surface, you idiot.
A rectangular prism has 6 flat surfaces
It has 6 faces which are its flat surfaces.
The flat surfaces of all polyhedra are called faces and a rectangular prism is simply one kind of polyhedron.
six
Faces
yes it does.
6
Cube, rectangular prism
8
The question is ambiguous since a rectangular pyramid and a rectangular prism will have different numbers of flat surfaces. There is no indication in the question which shape is intended.
A rectangular prism.
rectangular prism