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.
It could be called a pentahedral prism.
Hexagonal Prism
It is called an octagonal prism
heptagonal prism
pentagonal prism
pentagonal prism
A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
An octagonal prism.
It is a Triangular Prism.
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.