There is no greatest. Any polygon you draw, no matter how many sides it has,
I can always draw a polygon with more sides than yours has.
They don't all have names, but there's no limit to the number of sides they can have.
A polyhedron is a solid whose faces are polyhedra, so the question is rather meaningless.
It is a prism.
A prism.
The simplest shape is a hexagonal prism.
The greatest number of sides can be any amount of sides.
A polyhedron is a solid whose faces are polyhedra, so the question is rather meaningless.
Prism
A prism *always* has 2 bases. In case you meant "faces" instead of "bases", the prism with the smallest number of faces is the triangular prism - which has 5 faces. If there were any fewer number of faces, the prism which become a two dimensional object.
These are terms which are used in the context of polyhedra. A polyhedron is a 3-dimensional, solid shape which is bounded by polygons. Every such polygon is a face. However, some faces are also called bases and this depends on the polyhedron.All the faces of a pyramid, with the possible exception of one, are triangles. The one different face is called the base. In a triangular pyramid (tetrahedron) the face that is at the bottom is the base.A prism has two identical, parallel faces which may be any polygon. All the other faces are rectangles. A non-rectangular faces are called the bases. In a cuboid all six faces are rectangles and so any pair of opposite faces are called bases.
A regular polygon has equal sides and angles. A polygon has a surface area but a polyhedron has many faces as for example a pyramid.
A polygon with 20 sides is an icosagon.
A polygon. A prism has two identical bases or end-faces and these can be polygons with any number of sides.