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No, the shape is said to be equilateral. You can have equilateral triangles, 4-sided shapes such as rhombi, or polygons with 5 or more sides. A square is just one specific example.
the shape is a regular shape if it has all the same angles and side lengths.
A square or a rhombus
Parrallelogram
an equilateral triangle
A shape that has five sides is called a pentagon. A normal pentagon has all five sides that are the same length.
Isometric shape
Rhombus
a square
The same length.
Rectangle, parallelogram
It's a shape with many sides where all the sides are the same length.
This shape is called an icosikaitera. All of the sides of the icosikaitera are all of the same equal length.
trapezium
the shape is a regular shape if it has all the same angles and side lengths.
An octogan It wouldn't be an octogan unless all the sides were the same length. OCTO means 8
A square or a rhombus
it is three sides all with the same length