Answer:
2000
Explanation:
One way to do this is to add half of a thousand, then zero all digits to the right of the thousands place.
2371 +500 = 2871
With digits zeroed, this is ...
2000
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Additional comment
The traditional instruction is to look at the digit in the place to the right of the thousands place. (It is 3.) If it is 5 or more, you increase the number by 1 in the place you're rounding to. (No increase is needed.) Then you set all digits to the right of the thousands place to zero.
2371 rounds to 2000