You cannot since the triangular prism has faces meeting at 60 degrees - all the faces of a cube meet at right angles. You can have small cubes sitting within a triangular prism but they cannot "fit" into it.
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The answer obviously depends on the size of the prism!
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
A triangular prism
A triangular prism has two triangular faces, a rectangular prism does not have any.
A triangular prism.