Suppose for example a term has 9 digits, say abcdefghi. This means that the grid is
abc
def
ghi
and that the decimal concatenations abc, def, ghi, adg, beh, cfi are all squares. E.g., for 121256169 we see that 121, 256, 169, 121, 256 and 169 are squares.
There are 3 grids of size 1 X 1.
There are 4 grids of size 2 X 2.
There are 13 grids of size 3 X 3.
There are 14 grids of size 4 X 4.
There are 76 grids of size 5 X 5.
There are 108 grids of size 6 X 6.
There are 459 grids of size 7 X 7.
There are 844 grids of size 8 X 8.
No leading zeros are allowed in the rows and columns.
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