Question

What is the least number of 4-digits which is a perfect square?​

Answer 1

Answer:

31 2 =961

32²=1024

33 ³ =1089

34² =1156

Least number of four digits = 1000.

(32)2 is more than 1000 by 24.

So, the least number to be added to 1000 is 24.

1000 + 24 = 1024

Therefore, the smallest four digit number which is a perfect square is 1024.