Square of Small-Digit Palindromic Number is Palindromic/Examples/111,111

Example of Square of Small-Digit Palindromic Number is Palindromic

$111 \, 111^2 = 12 \, 345 \, 654 \, 321$

Proof

     111111
x    111111
----------
     111111
    1111110
   11111100
  111111000
 1111110000
11111100000
-----------
12345654321

$\blacksquare$