A square, be definition, can have only four sides: no more and no fewer. So a square with eight sides is impossible.
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A plane figure with eight sides is an octagon.
An Octagon has 8 sides. The other more popular shapes are Hexagon which has 6 sides, a Pentagon which has 5 sides, a Square which has 4 sides and a Triangle which has 3 sides.
A square prism has six sides
A square pyramid has a square base and four triangular sides. This gives it five faces, eight edges and five vertices.
A square has four parallel sides (two pairs of parallel sides).