Anything multiplied by the number 1 equals itself.
Examples:
10 x 1 = 10
200 x 1 = 200
52348253.234329 x 1 = 52348253.234329
It is known as the
Multiplicative Identity Property
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i x i = -1
When you add a number and its additive inverse, for example x+(-x), you would get 0 as an answer no matter what the number is. When you multiply a number and its reciprocal or multiplicative inverse, for example x*(1/x), you would always get 1 as an answer.
1 x 123, 3 x 41
1 x 69, 3 x 23
Well if you multiply 1 X 1 the answe is '1' Hence '1' is a square number.