If you're talking about whole numbers only, then it's 549.
If you also include decimals, then there isn't any'biggest'.
If I say it's 549, then you'll say I'm wrong, because 549.5 is bigger and still rounds to 500.
If I say it's 549.99, then you'll say I'm still wrong, because 549.999 is bigger and still rounds to 500.
Whatever number anybody says, there's always a bigger one that still rounds to 500.
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500
500
The largest integer that, when rounded to the nearest hundred, would round to 500, is 549.
The largest whole number would be 1,999
1000