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.
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prism and cylinder
Prism, Cylinder, and Cube
Cylinder, Cube, Prism.
A heptagonal prism has two 7-sided bases.
Sometimes,only because,a rectangular prism has two bases and four faces, but a triangular prism has two bases and three faces.