Prisms with any number of sides can have perpendicular faces. Often both end faces are perpendicular to the length.
In the case of a REGULAR octagonal prism, there will be four pairs of parallel faces, where each face of a pair will be perpendicular to the two faces of one of the other pairs.
There is not much that can be said with certainty about an irregular octagonal prism.
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An octagonal prism.
There can be a heptagonal prism or an octagonal prism, but there is no such thing as a hectagonal prism.
A prism with 16 vertices must be an octagonal prism and so has 10 faces.
It has 16 vertices and 10 faces. It is an octagonal prism.