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Five.
The differnence is that a triangular prism has 5 faces and and rectangular prism had 4 faces.
Octagonal prism - Number of vertices-16 Number of rectangular faces-8 Total number of faces-10
A square prism (a cuboid with at least two square faces at its ends).
A prism has two polygonal faces at each end and these may have any number of sides, n. The prism also has n rectangular faces.