A square of identical shape but not size is similar. For example, a square is always a square, whether big or small. Or, a box with 4 sides with exactly the same top and bottom will be similar, but these similar or identical boxes can be tiny....or huge. A circle will be similar to other circles, but size could differ.
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No. Two regular hexagons are always similar to each other, but two random hexagons are not necessarily similar.
Parallelogram
always
Because the figures are said to be similar to each other and retain the same angles
Similar shapes need to have the same number of sides, the same angles and the ratio of the sides needs to be the same. Rectangles are not always similar to each other because they can have different dimensions, which would break the "same ratio" rule.