√423 = 20.5669638012. 423 is not a perfect square; the result is irrational.

Is 423 a perfect square?

No, 423 is not a perfect square. Its square root is irrational.

What is 20.5669638012 squared?

20.5669638012 squared is approximately 423. (20.5669638012)² ≈ 423

Instant answer with step-by-step solution

√423 = 20.5669638012

√423 = 20.5669638012

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

We need to find √423 — a number that when multiplied by itself equals 423.
423 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): √423 = 423^0.5 = 20.5669638012
Verification: 20.5669638012 × 20.5669638012 ≈ 423 ✓ (rounded to 10 significant figures)

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