Sounds like a rectangular solid to me, such as an elongated box.
prism
A prism has two parallel and congruent bases in the shape of polygons. Example - a cereal box (is rectangular prism). The top and bottom are rectangles(a polygon). They are the same size and shape (congruent) and also parallel. A cube (think of six sided dice) is a special rectangular prism. Imagine a a box where the top and bottom are triangles (of the shape size and shape). This is called a triangular prism.
A hexagonal prism.A hexagonal prism.A hexagonal prism.A hexagonal prism.
cylinder
parallelogram, because if the two bases are congruent and parallel then the sides will also have to be parallel, so it is a parallelogram
Congruent polygons.
They could be pentahedra in the form of triangular prisms or octahedra in the form of triangular antiprisms.
That would be some kind of prism. To answer the question more specifically, I would need to know the shape of the bases.
A prism. The name of the prism usually reflects the polygonal shape of the bases eg triangular prism or rectangular prism.
Triangle
It is a cylinder
a cylinder!