Two: the two hexagons!
Hexagonal Prism
12
A hexagonal prism has 18 edges.
Six.
6
It depends on what kind of prism you mean. For example, a rectangular prism has 6 bases and a triangular prism has 5 bases. A triangular prism only has two bases.
A triangular prism has 2 bases on it!
You cannot make a hexagon out of rectangles and so you will never be able to make the two bases of the hexagonal prism. And these two hexagons, after all, are what give the shape its name.
a pentagonal prism has 2 bases
hexagon base prism
Each and every prism has two parallel congruent bases. It is the shape of these bases that give the name to the prism: a pentagonal prism has pentagons (not necessarily regular) for its bases.
A heptagonal prism has two 7-sided bases.