1+       ::*    "d"::** %       "V8":** -!     #v_ > > > > >
                                                    v
increment n  n*n  modulo 1000000  equal to 269696?  v  if false, loop to right
                                                    v
v"Smallest number whose square ends in 269696 is "0 <  else output n below
>:#,_$           .      55+,     @

ouput message  then n  newline  exit

numeric constants explained:

"d"  ascii value of 'd', i.e. 100
::   duplicate twice: 100,100,100
**   multiply twice: 100*100*100 = 1000000

"V8" ascii values of 'V' and '8', i.e. 86 and 56
:    duplicate the '8' (56): 86,56,56
**   multiply twice:  86*56*56 = 269696