They are
1*1 = 1
2*2 = 4
3*3 = 9
and so on until you get to
31*31 = 961
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Between 11000 and 2000 there are 8998 whole numbers! You really want them all? There are: 11001, 11002, 11003, 11004, ..., 19996, 19997, 19998, 19999.
1,4,9,16,25,36,49,64,81,100,121,144,169,196,225,256,289,324,361,400 All the square numbers up to 20!
There are 11520 of them.
No - but it is a square number. 1,3,6,10,15,21 & 28 are all triangular numbers. 1,4,9,16,25 & 36 are all square numbers.
11000