an octagon
It is called a hexagon because it has six faces and also six vertexes.
8 vertexes
Not sure about vertexes or prisim. A rectangular prism, on the other hand, has 8 vertices. Not vertexes.
A cylinder has no vertices (not vertexes!) It has 2 circular edges.
6 edges 4 vertexes
One.
4
1
5 vertexes, 4 faces, and 8 edges
two
Endless.