This means the nearest multiple of 1000. Multiples of 100 are
1000, 2000, 3000, 4000, 5000, 6000, 7000, 8000, 9000... etc. To
round to the nearest thousand, you identify which of these values
is closest to 7533.
7533 is in between 7000 and 8000, but closer to 8000, so your
answer would be 8000.