Two. The others are called lateral sides.
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!
a pentagonal prism has 2 bases
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.
It has 4 bases.
It has 5 bases
None. By definition, a triangular prism has triangular bases. If it had circular bases it would be a circular prism (cylinder).
A rhombus prism has 6 faces. Any or all of them could be considered bases.
A prism has two identical bases. These bases are parallel and congruent, and they define the shape of the prism. The sides connecting the bases are called lateral faces, which are typically rectangular or polygonal, depending on the shape of the bases.
It depends on the prism but cones will always have one.
A triangular prism has five bases because it can be flipped over to form five different bases