There is no name for it. A magagon has a million sides though. There's one for you.
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A polygon with 1000 sides is still a polygon but even a polygon of 100 sides gives characteristics of a circle. When demonstrating circles a polygon of 100 sides helps show the circle characteristics.
Heptadecagon.
hectagon is the answer
A polygon with 10 sides is called a decagon.
A polygon with 5 sides is called a Pentagon.