The base being the bottom of a shape.
A pyramid with a square base has 4 sides.
A pyramid with a triangular base has 3 sides.
4
a pentagon is a 5 sided figure so 5 (if you mean sides, not bases)
a closed figure with multi-number of sides
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A prism has two bases that are identical polygons. Suppose these have n sides each. Then there will be n lateral faces so that the total number of faces is n+2.
The bases and sides of a cube are squares. The bases and sides of a rectangular prism are rectangles.
parallel sides
As many as there are sides on the bases.
The parallel sides of a trapezoid are the two bases
A prism has a variety of bases but the sides are always parallelograms. A triangular prism has a triangle as the two bases and parallelograms as lateral sides. A pyramid has a variety of bases but the sides are triangles.
There is none. The number of sides on the bases can always be increased reuslting in an increase in the number of lateral faces. The number of vertices and edges will also increase so there can be no greatest number.
A Pyramid is a Geometric Solid whose sides are Triangles, that meet at its Apex. Pyramids can have Square bases (and thus 4 sides), or Triangular bases (and 3 sides).