It's 4. (31,622)2 = 999,950,884 .
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Thghj
999,950,884 = (31,622)2
The smallest 5-digit integer perfect square is 10,000 = (100)2The largest 5-digit integer perfect square is 99,856 = (316)2So we want to know how many numbers that is, from 100 to 316 inclusive.It's 316 minus the first 99 = 217 of them.
9998244 (3162 sqrd)