A football has a curved surface and polygons are flat. You can approximate a curved surface quite well if you use enough polygons but each polygon will still be flat and a football does have a curved (and rough) surface. Using a few thousand polygons you can create an approximation of a football with stitching seams and every detail but you will not have a curved surface you will have an approximation of a curved surface.
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Explain why the shape of a football in not a polygon
It has a curved surface.
Because a football is a three dimensional object whereas polygons are two dimensional shapes.
A polygon is any closed shape with five sides
An internal angle of the polygon.