9*9= 81 ; 8+1 = 9!

45*45= 2025 ; 20 +25 = 45 !

55*55 = 3025 ; 30 + 25 = 55!

99*99= 9801 ; 98+01 = 99!

703*703= 494209 ; 494+209= 703!

5292*5292 = 28005264 ; 28+ 005264 = 5292!

This magic can also be seen on 2728, 857143 etc...