Using the nine decimal digits 1 to 9 once and once only, construct four square numbers.

Square numbers are from the sequence of squares:
1, 4, 9, 16, 25, 36.. etc. You can't use the square of ten because it contains zeros and you can't use the square of 11 = 121 because it needs two 1's. But there are many more that you can use.
 
 

ANSWER(S)

Two members found all four possible ways to use the digits 1 to 9: they were our usual pair: John Stafford and Richard Birkhill. Well Done. Here are the 4 answers:

1   4   9   872356

1   36   529   784

9   25   361   784

9   81   324   576

There was no prize draw this month.