It's quite acceptable to call it a 25-agon but what's more important is knowing how to work out its properties.
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The formula for the sum of the interior angles of a polygon is: 180 * (n - 2) where n is the number of sides of the polygon. So the sum of the angles of a polygon with 25 sides is 180 * 23 = 4,140.
ICOSITEPENTAGON
Above a certain number of sides, a polygon is simply called an n-gon, with the letter "n" representing the number of sides. So, in your case, a 25-gon.
None. Since the number of sides is odd, there can be no parallel sides.
A polygon with 6 sides is a hexagon and a polygon with 8 sides is an octagon