A rhombus has 4 vertices, therefore a rhombic prism has 4 x 2 = 8 vertices.
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6 sides
An octagonal prism has 16 vertices
Not sure how many a rectagular prism douse have but a rectangular prism does have 8 vertices.
A prism with 9 faces is a heptagonal prism. That has 14 vertices.
A rectangular prism has 8 vertices/corners.