Negative numbers do not have "real number" square roots.
However, they will have two roots (when using imaginary numbers) as do other numbers, where a root including i(square root of -1) is positive or negative.
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All positive numbers have two. 0 has only one. Negative numbers have two imaginary roots but no real ones.
It belongs to many many subsets including: {sqrt(13)}, The set of square roots of integers The set of square roots of primes The set of square roots of numbers between 12 and 27 {3, -9, sqrt(13)} The set of irrational numbers The set of real numbers
Two, a positive and a negative.
The square root of 0 is 0. Since 0 has no positive or negative equivalent, this is its only square root.
There are many pairs of consecutive whole numbers that lie between the square roots of 46, which are approx -6.78 and +6.78. -4 and -3, for example.