Question

Question 2

Write the correct answer from the given four options.

Which of the following is a square of an even number?

a) 144
b) 169
c) 441
d) 625

Answer 1

Here, $144=(12{)}^2$
Similarly, $169=(13{)}^2$
$441=(21{)}^2$
$625=(25{)}^2$
Thus, 144 is a square of an even number.

Alternate Method
We know that square of an even number is always an even number. Hence 169, 441 and 625 are not even numbers. So, only 144 is an even number, which is the square of 12.