√661 = 25.7099202644. 661 is not a perfect square; the result is irrational.

Is 661 a perfect square?

No, 661 is not a perfect square. Its square root is irrational.

What is 25.7099202644 squared?

25.7099202644 squared is approximately 661. (25.7099202644)² ≈ 661

Instant answer with step-by-step solution

√661 = 25.7099202644

√661 = 25.7099202644

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

We need to find √661 — a number that when multiplied by itself equals 661.
661 is not a perfect square. Its square root is irrational.
It falls between √625 = 25 and √676 = 26.
Using the formula √N = N^(1/2): √661 = 661^0.5 = 25.7099202644
Verification: 25.7099202644 × 25.7099202644 ≈ 661 ✓ (rounded to 10 significant figures)

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