Prisms come in many shapes and sizes but all prisms must have flat sides - no curved sides so a Pyramid having flat sides and no curves is a prism.
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That is utter rubbish.
Both pyramids and prisms are polyhedra. That means they are solid shapes bounded by plane faces. Neither of them can have curved faces.
A pyramid has one polygonal base and triangular faces that rise from the base and meet at an apex. A prism has two congruent parallel bases that are linked together by rectangular faces.
Both terms are generic: they do not specify the polygonal bases.
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Pyramids only have square bases.Triangular prisms have triangle bases.Pyramids have triangle "faces".Triangular prisms have rectangular "faces".
Measure any two corresponding edges. The ratio of these edges is the similarity ratio.
Some hexahedra are prisms or pyramids.
Pyramids end in one vertex and prisms end in multiple vertices. E.g. Rectangular Prisms are like cubes( multiple vertices) and pyramids are like cones (one vertex).
Pyramids Have only one base, Prisms have two bases/sides that are opposite and exactly the same.