Yes. It is one of the five regular polyhedra known from ancient Greek times or earlier.
See http://www.math.rutgers.edu/~erowland/polyhedra.html .
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In geometry, an octahedron is a polyhedron with eight sides. A regular octahedron is the dual polyhedron of a cube; It is a rectified tetrahedron.
Cube is a 3 Dimentional object and polygon is a 2 Dimentional object, so cube can not be considered as polygon. this is same question if circle is a sphere? (dimensional)
A cube could be described as a box, or as a three dimensional square.
A cube 😄👍😊🌷🎉
A polygon is a flat figure, like a square. A polyhedron is a 3D figure, like a cube.