Is 645 a perfect square?

No, 645 is not a perfect square. Its square root is irrational.

What is 25.3968501984 squared?

25.3968501984 squared is approximately 645. (25.3968501984)² ≈ 645

√645 = 25.3968501984. 645 is not a perfect square; the result is irrational.

Instant answer with step-by-step solution

√645 = 25.3968501984

√645 = 25.3968501984

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

We need to find √645 — a number that when multiplied by itself equals 645.
645 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): √645 = 645^0.5 = 25.3968501984
Verification: 25.3968501984 × 25.3968501984 ≈ 645 ✓ (rounded to 10 significant figures)

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