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Yes, but only if one face of one prism is congruent to a face of the other.
Any. You can have a triangular pyramid (tetrahedron), a rectangular one, a pentagonal one, and so on. Similarly, you can have a triangular prism, a rectangular prism, and so on.
They form a stronger wall as they interlock
An octahedron. It could be in the form of a heptagonal pyramid, a hexagonal prism, or a rectangular dipyramid (two rectangular pyramids stuck together along their bases).
Rectangular is an adjective, not a noun so there is no such thing as a rectangular. You an have a rectangular lamina, a rectangular pyramid, a rectangular prism, a rectangular antiprism and they all have different solid shapes.