So he says round of 598,587 to the nearest 10,000

The given number, 598,587, can be rounded to the nearest 10,000 by looking at the digit in the thousands place. If the digit is 5 or above, it will be rounded up, and if it is below 5, it will be rounded down.

In this case, the digit in the thousands place is 9, which is greater than 5. Therefore, rounding up occurs.

Rounding 598,587 to the nearest 10,000 results in 600,000.