Question

Find the square root of 441.

• A. 22
• B. 21
• C. 19
• D. 29

Answer 1

The correct option is B 21

The prime factors of $441=3\times 7\times 3\times 7=3^2\times 7^2$. Therefore the square root of 441, $\sqrt{441}=3\times 7=21$.