出典:Wikipedia
出典:『Wikipedia』 (2011/07/15 20:16 UTC 版)
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. So, for example, 9 is a square number, since it can be written as 3 × 3. Square numbers are non-negative. Another way of saying that a (non-negative) number is a square number, is that its square root is again an integer. For example, √9 = 3, so 9 is a square number.
![]()
a square number
the square root of a number
奇数.
偶数.
the plural number
the singular number
the units used to measure angles, called degrees