What is the Square Root of 21?
The square root of 21 (√21) is 4.582576. 21 is an irrational square root rounded to 4.582576.
Exact Answer
√21 = 4.582576
Principal Root (√21)
4.582576
Real Roots
±4.582576
Perfect Square?
No (Irrational)
Exponential Form
21^(1/2)
Step-by-Step Solution: √21 = 4.582576
Step 1
Definition of Square Root
The square root of 21 is the number y such that y × y = 21.
√21 = 4.582576
Summary & Alternative Representations
| Property / Format | Value |
|---|---|
| Principal Root (√21) | 4.582576 |
| Real Roots | ±4.582576 |
| Perfect Square? | No (Irrational) |
| Exponential Form | 21^(1/2) |
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Frequently Asked Questions
Is 21 a perfect square?
No, 21 is not a perfect square; its decimal approximation is 4.582576.