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It could be: 6208
001234557889 is the answer.
Every square of a 4 digit number has more than four digits.
A 5-digit number that is divisible by 4 can be any number in the form of ( 10,000n ), where ( n ) is an integer. This means the last two digits of the number must form a number divisible by 4. Therefore, the possible last two digits could be 00, 04, 08, 12, 16, ..., 96.
Interesting.Social Security numbers all have the form: (3 digits) - (2 digits) - (4 digits).That's 9 digits altogether. If you ignore the dashes, you get: xxx,xxx,xxx .With 9 places, there are 1 billion possible different numbers.