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All seven sided polygons are known as "heptagons". Heptagons that have all side lengths the same are known as "regular heptagons".
No. Regular heptagons (seven sides) doesn't tessellate alone.
They are only congruent if they are also the same size. Otherwise they are merely similar.
No. Equilateral heptagons (7 sided figures) do not tessellate the plane. Not if no other polygons are allowed. But if you allow a (non-equilateral) pentagon then you might be able to tessellate the plane!
Yes.