Octagonal prism?
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Adding to what Kittenono said, an octagon is a two dimensional shape which only has length and width. A polyhedron is 3 dimensional which has length, width and height.
An octagon is a 2 dimensional object, not a 3 dimensional object. As such, it has 1 face, 8 corners, and 8 angles.
An octagon is a two-dimensional shape.
If it's a polygon (2 dimensional) then an octagon. If it's a polyhedron (3 dimensional) then a rectangular prism (or a cube).
An octagon is a 2 dimensional shaped 8 sided polygon