The square root of an even number can be an even number (if it is a perfect square), or an irrational number (if it is not).
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no
No.
Only whole numbers are even or odd, and the square root of 75 is not a whole number.
Yes, but only if you count a root at the tangent as a double root.
I cannot see how odd or even will determine the number of digits in the square root. For example:100 is an even number, and its square root is 10 (2 digits)121 is an odd number, and its square root is 11 (2 digits)Maybe the question is not phrased properly for what the questioner is asking.