The flat surface of any three dimensional object is called a face; a prism is a three dimensional object.
A tetrahedron has 4 faces, a cube has 6 faces, an octahedron has 8 faces, etc.
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All rectangular prisms have six faces, but if it's a RECTANGULAR prism, it's not possible for it to have six SQUARE faces, they only have two of those. In total, they usually have four rectangular faces and two square faces.
A base
A rectangular prism?
flat surfaces on any polyhedron are called faces
A polyhedron with six faces is often called a cuboid. It is also called a rectangular parallelepiped or a rectangular hexahedron, or sometimes simply, a box.