To look at it, you could never tell it from a circle.
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I know 1,000,000 is hecatommyriagon, but that is the closest i know.
A million sided shape shape is called a megagon.
There is no such thing as a 1 sided shape nor a two sided shape.
An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.
A fifteen sided shape is called a pentadecagon.