no, if it does, then it's a square
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A regular nonagon aka enneagon
In equilateral triangle : sides are equal and angles are equal. So if all sides sre equal then the angles between them would be equal. The angles would equal 60 degrees. In an isosceles triagle, two of the three sides are equal. In a scalene triangle, all of the sides are different.
2 is already prime; no factorization.
4 of them.
All whole numbers are integers.