Expressed as a decimal, rounded to two decimal places, sqrt(2002) = ±44.74
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The number 2002 is not square. For a number to be square, its square root must be a whole number (nothing to the right of the decimal). The square root of 2002 is 44.74371464...
Try it out. Take the square root on a calculator, and see whether you get a whole number.
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.