The square root of 997,920 is approximately 998.959.

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Here are 5 related questions you might find interesting:

1. What is the square root of 3,991,680?
2. How do you calculate the square root of a number without a calculator?
3. What is the cube root of 997,920?
4. What is 997,920 divided by 9?
5. How would you round 998.959 to the nearest whole number?

Tip: When estimating square roots, knowing the squares of integers close to your number can help you make a quick approximation.