All positive numbers have two. 0 has only one. Negative numbers have two imaginary roots but no real ones.
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Two, a positive and a negative.
There are infinitely many of them. The square of every odd number will be an odd square number.
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.
It has two of them: +7 and -7 .
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