Question

find the least number which must be subtracted from 1989 so as to get a perfect sqare

Answer 1

In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having two and only two sides of equal length, and sometimes as having at least two

Answer 2

We know that 44² = 1936

so, 1989 - x = 1936 
so, x = 53 
the least number which must be subtracted from 1989 so as to get a perfect square = 53