If 1) 27 2) 28 3) 29 4) 26 then 5) ?

Question

If
51 x 51 = 26 01
52 x 52 = 27 04
53 x 53 = 28 09
54 x 54 = 29 16
55 x 55 = 30 25
56 x 56 = 31 36
then
57 x 57 = ?? ??

Answer 1

by symmetry it should be 25