A cube has six faces (sides).
Many solid shapes could have 6 faces, but the most common such shape, with 6 equal faces, is the cube.
A cube. A cube. A cube. A cube.
Since a cube has 6 faces, you would be looking for a solid shape with only 2 faces and no such solid exists.
a cube.
A cube
Cube
cube
A cube
cube
a cube
Cube
cube