Answer is 4000000:
The sum of the first N odd numbers is N^2.
Look at 1,3,5 for example. There are 3 numbers and the sum is 9 which is 3^2.
Add 7 and the sum is 16 which is 4^2.
So the of the first 2000 consecutive odd numbers is 2000^2
Note 2000 is 2(10^3). When we square that it is 4x10^6=4000000
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The sum of the first 30 consecutive odd numbers is 900.
The sum of the first 900 consecutive odd numbers is 810,000.
The sum of the first 350 consecutive odd numbers is 122,500.
The sum of the first 30 consecutive odd numbers is 900.
The sum of the first 450 consecutive odd numbers is 450 squared or 202,500.