Question: does every positive number have 2 square roots

Answer: Yes, Every positive number a has two square roots: √a, which is positive, and −√a, which is negative. Together, these two roots are denoted as ± √a (see ± shorthand). Although the principal square root of a positive number is only one of its two square roots, the designation ``the square root'' is often used to refer to the principal square root. For positive a, the principal square root can also be written in exponent notation, as a.