I did. I'm just having fun with the sloppy problem statement. If you
don't ask for what you want you might get what you ask for rather than
what you had in mind. The solver might decide that the OP really meant
something different, and solve some other problem, which may or may
not be what was
First look at the last digit. If it is 2,3,7, or 8 the number is not a
perfect square.
Then use an integer formulation of Newton's method. For input value x,
start with a guess y. If you can arrange for y to be about half the
number of digits in x, that is good.
Then repeatedly set y=(y*y+x)/(2*y)
