3-dimensional, if it's in real life. If it's merely a picture, then it's a 2-dimensional object depicting something that's 3-dimensional.
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No. A polygon is a 2-dimensional figure. A polyhedron is 3-dimensional.
2 dimensional figures just have width and length, if you were to add the height dimension it would become 3 dimensional.
For the word' object' , do you mean a 2-dimensional shape, or a 3-dimensional solid. 2-dimensional ; is a nonagon 3-dimensional ; is a nonahedron.
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A cube is a 3-dimensional shape. Squares are 2D.