Octagon if you're talking polygon but a rectangular pyramid has 8 edges.
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A cube.
A square is not a polyhedron, it is a polygon. A cube is not a polygon, it is a polyhedron.A square has 4 edges and 4 vertexes. It has no faces because it is not a polyhedron. If you cut the corners off of a square, the new polygon has 8 edges and 8 vertexes.A cube has 6 faces, 12 edges, and 8 vertexes. If you cut the corners off of a cube, the new polyhedron has 14 faces, 36 edges, and 24 vertexes.
The numbers given do not satisfy the Euler characteristic for a polyhedron. There is, therefore, no such polyhedron.
There is not a polyhedron with the given number of faces, edges and vertices.
It has 6 vertices.