They are polyhedra.
They have [at least] one square face.
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A cube has 12 edges, a square pyramid has 8. So a cube.
1 a cube has 6 faces and a square pyramid has 5
the pyramid is a solid triangle. aka pyramid. A cube is well a solid square that is 3D. So is a pyramid.
In a square pyramid, there are triangles as some of the sides. Only the base is a square, whereas in a cube, all faces are squares.
Assuming a square-based pyramid. 4 more edges in a cube than in a pyramid.