Palindromic number 698,896

The number 698,896 (a palindrome) is the square of 836. Is this the only square palindrome containing an even number of digits?

Well, no. Here are other Palindromic Squares

http://www.fengyuan.com/palindrome.html

228138929476341405^2 = 52047371142611077177011624117374025
404099764753665981^2 = 163296619873968186681869378916692361
2282211769458230805^2 = 5208490560653668833388663560650948025

http://www.worldofnumbers.com/square.htm#miben

N.B. More research is needed. There are others that escape detection!