The word prism come from the Greek prisma for "something sawed". The shape resembles the piece that you get when you saw a corner off a plank of wood.
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It is called a cuboid.
It is simply called a pentagonal prism. That is a prism based on the 2D shape known as a pentagon.
It could be called a square prism but a more common name would be a cuboid.
A rectangular prism with 6 congruent faces is called a cube.
The only two parallel faces on a prism are the ends.