18, 20, 22, 24, 26. 5 even integers
500 of them.
48
Eleven -10, -8,-6,-4,-2,0,2,4,6,8,10
9000 integers.
750
There are 1,963 such integers. Every factor of a number has a pair. The only time there will be an odd number of factors is if one factor is repeated, ie the number is a perfect square. So the question is really asking: how many positive integers less than 2008 (in the range 1 to 2007) are not perfect squares. √2007 = 44 and a bit (it lies between 44 and 45) So there are 44 integers less than (or equal to) 2007 which are perfect squares → 2007 - 44 = 1963 integers are not perfect squares in the range 1-2007 and have an even number of factors (divisors).
There are 10 even integers between -10 and 10 (excluding -10 and 10).
The even integers between -4 and 4 are: -4, -2, 0, 2, 4
1001
18, 20, 22, 24, 26. 5 even integers
500
Infinitely many, since every positive number is a square of some other number. However, there are 21 perfect squares (SQUARES OF INTEGERS). From 112 to 312, inclusive.
500 of them.
( -2,0,2 ) three
48
Only integers are even, so there are 9: 4,6,8,10,12,14,16,18, and 20.