It is irrational
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45 is a rational number
Square root of 45 times square root of 45 = 45
44 and 45 because the square of 2000 is an irrational number and it is 44.721 to 3 decimal places
45 is the square root of 2,025 (45 x 45 = 2025).
√45 = 6.708203932499369