A decagon.
That will depend on its dimensions but it has more sides than a square because it has 6 sides whereas a square has 4 sides
No, four sides.
2 because an hexagon has 6 sides whereas a square has 4 sides
Yes.
A decagon has 10 sides and a square has 4. So 10-4=6 more sides
For the very simple reason that a square has more sides than a triangle.
Pentagon.
A square always has, and any polygon with more than four sides can have.
A square has all four equilateral sides, whereas a rectangle has two sets opposite sides that are congruent. A rectangle can be a square, but a square can not be a rectangle.
square
A square
The pentagon satisfies those criteria precisely.