The first question of Java Group B of the 8th Blue Bridge Cup National Championship

Title: Square Ten Digits


The 10 digits from 0 to 9 are not repeated or omitted, and many 10 digits can be formed.
Many of these also happen to be squares (the square of a number).


For example: 1026753849, which is the smallest square number.


Could you please find out what is the largest square number among them?


Note: What you need to submit is a 10-digit number, don't fill in any extras.

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