6.
I'm learning geometry in school so I believe its 6.
6
a triangular prism has to triangular bases while a rectangular prism has a rectangle as the bases.
There are 6 bases
62 bases
none
One base
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 rectangular cube (a cuboid) is a kind of prism and, by convention, prisms have two bases.
rectangular prism
Rectangular prism
Both have rectangular bases.
four