How many bases does a quadrangular prism have?

Answer 1

Any such figure has only one base; the one that it stands upon.

If you are asking "How many faces does the quadrangular prism have?" then its "ends" are both quadrangular shapes (i.e. rectangles) and there are 4 more rectangles forming the "length" of the prism so the answer is 6

These rectangular shapes are more accurately called "faces"; the edges of the rectangles are called "edges", and the corners are called "vertices".

Your quadrangular prism has 6 faces, 12 edges and 8 vertices.