Mathematics

• Square number
  Square number
  In mathematics, a square number, sometimes also called a perfect square, is an integer that is the square of an integer; in other words, it is the product of some integer with itself...
  
  , a number that is a product of some integer with itself, e.g. 9 is a square number, its square root is 3
• Perfect square dissection, a dissection of a geometric square into smaller squares, all of different sizes
• Perfect square trinomials, a mathematical identity