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what is the squared root of 1,000,000?

In mathematics, a square root of a number a is a number y such that y² = a, in other words, a number y whose square (the result of multiplying the number by itself, or y * y) is a. For example, 4 and -4 are square roots of 16 because 4² = (-4)² = 16. 

It should be 1000

1. 7.3
2. 81.16
3. 36.510