Question

If a number has odd number of zeros at the end , the square of that number will always be

• A. even
• B. odd
• C. prime
• D. none of these

Answer 1

The correct option is A even

$3000\times 3000=9\underset{–}{000}000$
$40\times 40=16\underset{–}{00}$
Odd number of zeros$+$Odd number of zeros$=$even number of zeros

Therefore, A is the correct answer.