√402 = 20.0499376558. 402 is not a perfect square; the result is irrational.

Is 402 a perfect square?

No, 402 is not a perfect square. Its square root is irrational.

What is 20.0499376558 squared?

20.0499376558 squared is approximately 402. (20.0499376558)² ≈ 402

Instant answer with step-by-step solution

√402 = 20.0499376558

√402 = 20.0499376558

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

We need to find √402 — a number that when multiplied by itself equals 402.
402 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): √402 = 402^0.5 = 20.0499376558
Verification: 20.0499376558 × 20.0499376558 ≈ 402 ✓ (rounded to 10 significant figures)

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