Two.
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That all depends on the type of faces a prism has. Then, you should have at most 3 pairs of congruent faces on the opposite sides of the prism.
It should have a pair of congruent pentagons. Of the five faces along the axes all, some or none may be congruent.
The six sides of the prism are mutually congruent if the hexagon is a regular one. One base is also congruent to the opposite base. ----------------- (The illustration is an octagonal prism.)
My answer to that question is eight sides. * * * * * Actually, there is no single answer because a prism is a generic term which is used to describe a polyhedron with two congruent and parallel bases and a number of rectangular faces joining them. If the base is a polygon with n sides (n ≥ 3), then the corresponding prism has n+2 faces. So a prism can have 5 or more faces.
A square prism has six faces.