√420 = 20.4939015319. 420 is not a perfect square; the result is irrational.

Is 420 a perfect square?

No, 420 is not a perfect square. Its square root is irrational.

What is 20.4939015319 squared?

20.4939015319 squared is approximately 420. (20.4939015319)² ≈ 420

Instant answer with step-by-step solution

√420 = 20.4939015319

√420 = 20.4939015319

⚠ 420 is not a perfect square — result rounded to 10 significant figures

We need to find √420 — a number that when multiplied by itself equals 420.
420 is not a perfect square. Its square root is irrational.
It falls between √400 = 20 and √441 = 21.
Using the formula √N = N^(1/2): √420 = 420^0.5 = 20.4939015319
Verification: 20.4939015319 × 20.4939015319 ≈ 420 ✓ (rounded to 10 significant figures)

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