a heptagon is the only polygon that has seven sides
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Regular polygons with even sides if there are 6 or more of them; selected irregular polygons with seven or more odd numbers of sides.
Different kinds of polygons have different numbers of sides. For example, a pentagon has five sides, a hexagon has six sides, a heptagon has seven sides and an octagon has eight sides.
Quadrilaterals are polygons with four sides. Triangles are polygons with three sides.
All quadrilateral polygons have 4 sides
Infinitely many. Polygons with 6 or more sides can have 3 pairs of parallel lines. Polygons with 7 or more sides can have a set of three parallel lines.