No, a circle is not a prism as all prisms are 3D. A 3D 'circle (for want of a better word) is a sphere.
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A Cylinder
A prism. A prism is named for its base, eg a triangular prism has a triangle for the base. If the base is a circle, the circular prism is called a cylinder.
It depends on the prism. Is it a triangular prism, a rectangular prism, a pentagonal prism... etc..
Triangular Prism Rectangular Prism Polygonal Prism Hexagonal Prism
an oblique prism is slanted and a regular prism is not, its right.