olemus
matemaatikas:
(1a) võrdkülgne täisnurkne nelinurk
(1b) arvu või avaldise korrutis iseendaga

Wiktionary:
1. (geometry) a polygon with four sides of equal length and four right angles; an equilateral rectangle; a regular quadrilateral
5. (mathematics) the product of a number or quantity multiplied by itself; the second power of a number, value, term or expression
64 is the square of 8.

ülevaateid
https://en.wikipedia.org/wiki/Square
https://en.wikipedia.org/wiki/Square_(algebra)