√665 = 25.7875939165. 665 is not a perfect square; the result is irrational.

Is 665 a perfect square?

No, 665 is not a perfect square. Its square root is irrational.

What is 25.7875939165 squared?

25.7875939165 squared is approximately 665. (25.7875939165)² ≈ 665

Instant answer with step-by-step solution

√665 = 25.7875939165

√665 = 25.7875939165

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

We need to find √665 — a number that when multiplied by itself equals 665.
665 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): √665 = 665^0.5 = 25.7875939165
Verification: 25.7875939165 × 25.7875939165 ≈ 665 ✓ (rounded to 10 significant figures)

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