Question

121,144,169,196.. what’s next

Answer 1

We must recall that:

In mathematics, a square number or perfect square is an integer that is the square of an integer; in other words, it is the product of some integer with itself.

Given: $121,144,169,196,...$

$121=11^2\\144=12^2\\169=13^2\\196=14^2\\225=15^2$

Hence answer is $225.$