A rectangle has four sides with two equal lengths.
A parallelogram is a four sided shape where opposite sides are parallel and equal lengths. If you mean that ALL sides are equal lengths, you are looking for a rhombus.
It is a rhombus
square
There are no specific names for such a shape.
Rectangle
A rhombus is a shape having two acute angles and four equal sides.
It's the sum of the various individual lengths of the four sides.
A "parallelogram" technically is a shape where opposite sides are equal and any shape with four sides is a "quadrilateral". Every square has four sides of equal length, so a square is both a parallelogram and a quadrilateral. A rhombus(or diamond shape) can have four sides of equal length and can be a parallelogram as well, so either are possibilities.
That shape is a square. A square is a special kind of rhombus, and a rhombus is aspecial kind of parallelogram. So the shape described in the question is a square,a rhombus, and a parallelogram.ALSO . . . any polygon with more than four sides can have four equal sidesand four right angles.
A rectangle.
The rectangle
A square is a two-dimensional shape with four equal sides and four right angles.