Question

find the least number which must be subtracted to 2178 so that the resulting number in perfect square​

Answer 1

$\huge\boxed{\fcolorbox{black}{pink}{Answer}}$

2178=2×3×3×11×11

We know that

By pairing the same kind of factors, one factors 2 is left unpaired.

So to make it a pair we must multiply it by 2

Required least number =2

Square root of 2178×2=4356

Here

2×3×11=66

$\textbf{Hope\: it\: helps\: you\: ❤️ }$