Answer:
According to Wolfram, "sided polygon in which the sides are all the same length and are symmetrically placed about a common center."
According to TheSchoolRun, "A polygon is a flat, two-dimensional (2D) shape with straight sides that is fully closed (all the sides are joined up). The sides must be straight. Polygons may have any number of sides. A polygon. A shape with curved sides is not a polygon."
So, yes, that is indeed a polygon.