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The square root of a number is the number that would have to be multiplied by itself to get the original number. For example, the square root of 9 is 3 as 3 multiplied by 3 is 9. The square root of 558,009 is 747, as 747 multiplied by 747 is 558,009.< The square root of 8 is 2.8284271247461900976033774484194 as 2.8284271247461900976033774484194 multiplied by 2.8284271247461900976033774484194 is 8.