Question

By splitting into prime factors, find the square root of $396900$

• A. $630$
• B. $450$
• C. $520$
• D. $620$

Answer 1

The correct option is A $630$

Prime factorisation of $396900=2^2\times 3^4\times 5^2\times 7^2$
$\sqrt{396900}=\sqrt{2^2\times 3^4\times 5^2\times 7^2}=2\times 3^2\times 5\times 7=630$.