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# Introduction of Square Numbers

 SIde of a square (in cm) Area of the square (in "cm"^2) 1 1 xx 1 = 1 = 1^2 2 2 xx 2 = 4 = 2^2 3 3 xx 3 = 9 = 3^2 5 5 xx 5 = 25 = 5^2 8 8 xx 8 = 64 = 8^2 a a xx a = a^2
Such numbers like 1, 4, 9, 16, 25, ... are known as square numbers. In general, if a natural number m can be expressed as n^2, where n is also a natural number, then m is a square number.