Who invented square numbers?

Answer 1

Square numbers were not "invented" by a single individual, as they are a mathematical concept that has been understood and studied for thousands of years. The concept of square numbers dates back to ancient civilizations such as the Babylonians and Greeks. The term "square number" refers to the result of multiplying an integer by itself, resulting in a number that forms a square when represented visually.

Answer 2

According to Askville...

"The ancient Babylonians routinely manipulated squares and square roots (see below)

The term square is as old as the oldest written record. The ancient Babylonians routinely manipulated squares and square roots.

Babylonian mathematics was, in many ways, more advanced than Egyptian maths. They could extract square and cube roots, work with Pythagorean triples 1200 years before Pythagoras, had a knowledge of pi and possibly e (the exponential function), could solve some quadratics and even polynomials of degree 8, solved linear equations and could also deal with circular measurement. Babylonian mathematics was based much more on algebra and less on geometry, in contrast to the Greeks."

Answer 3

Lagrange