just take a a number like 32 and square it, you have 1024 this is the smallest one. Another is 1681 since this is 41 squared
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There are 28706 such combinations. 5456 of these comprise three 2-digit numbers, 19008 comprise two 2-digit numbers and two 1-digit numbers, 4158 comprise one 2-digit number and four 1-digit numbers and 84 comprise six 1-digit numbers.
1024
Add the two greatest possible four digit numbers. 9999 + 9999
8100
7