Five.
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A square prism (a cuboid with at least two square faces at its ends).
The differnence is that a triangular prism has 5 faces and and rectangular prism had 4 faces.
A prism that has 6 faces quadarileral.
A rectangular prism has 6 faces. A pentagon prism has 7 faces. Therefore a rectangular prism has one less face than a pentagonal prism.