72 is rectangular.
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The square root of 72 is an irrational number. Since 72 is not a perfect square, the decimal is endless. (just like the value of pi)
a square number is with two products the same i.e. if multiply a number by itself you get a square number. e.g. 8 * 8 = 64, 9 * 9 = 81, 10 * 10 = 100 So 72 is not a square number.
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49 equals 72, and the next square number is 82 = 64.
To square a number you multiply it by itself. 7 x 7 = 49. or, 72 = 49.