Here are the written English numbers in four groups: 1 to 20, 21-100, 101 to 999, and 1000 to 999,000.
The numbers 1 to 20 :
1 one
2 two
3 three
4 four
5 five
6 six
7 seven
8 eight
9 nine
10 ten
11 eleven
12 twelve
13 thirteen
14 fourteen
15 fifteen
16 sixteen
17 seventeen
18 eighteen
19 nineteen
20 twenty
The numbers from 21 to 100 use the numbers 1 to 9, preceded by a tens number
21 twenty-one, 22 twenty-two, etc.
30 thirty (31 thirty-one, 32 thirty-two, etc.)
40 forty (41 forty-one, 42 forty-two, etc.)
50 fifty
60 sixty
70 seventy
80 eighty
90 ninety
100 one hundred
The numbers from 101 to 999 put a hundreds value (one hundred, two hundred) in front of the last two digits as above :
101 one hundred one
111 one hundred eleven
121 one hundred twenty-one
201 two hundred one
211 two hundred eleven
221 two hundred twenty-one
1000 one thousand
The numbers 1001 to 999,999 put the thousands value (one thousand, two thousand, eleven thousand, one hundred thousand) as a separate number followed by thousand), then the number as from 1 to 999.
1001 one thousand one (also one thousand and one)
1011 one thousand eleven
1111 one thousand one hundred eleven
9999 nine thousand nine hundred ninety-nine
10000 ten thousand
11000 eleven thousand
21000 twenty-one thousand
21111 twenty-one thousand, one hundred eleven (note comma often used)
110000 one hundred ten thousand (also one hundred and ten thousand)
111000 one hundred eleven thousand (also one hundred and eleven thousand)
999999 nine hundred ninety-nine thousand, nine hundred ninety-nine
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All the numbers between 999 and 3000 are four-digit numbers. You need to subtract 3000 - 999 - 1. The extra -1 is to account for the fact that the numbers 999 and 3000, in this case, are not included.
3000 = 3000/1
√2000 ≅ 44.7 √3000 ≅ 54.8 The squares of 45 to 54 lie within the range 2000 to 3000. There are thus 10 perfect square numbers between 2000 and 3000.
You can find a list here: http://www.naturalnumbers.org/psquares.html Or simply do some calculations in Excel. The idea is to calculate the following: 1 x 1 = 1 2 x 2 = 4 3 x 3 = 9 4 x 4 = 16 etc., until you pass the threshold of 3000.
If you include the number 3,000, there are exactly 2,001 4-digit numbers between 500 and 3000.