Total number of 2-digit numbers = (99 - 9) = 90 of them
Every number that isn't a perfect square has an even number of factors.
2-digit numbers that are perfect squares: 16, 25, 36, 49, 64, and 81 = 6 of them
Remaining 2-digit numbers = (99 - 6) = 93 .
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100
Half of them. Every other number from 0 to 99998 is even. Since there are 90,000 five digit numbers, that means that 45,000 of them are even.
There are 450 even three-digit integers, from 100 to 998. This excludes numbers with leading zeroes (000 to 099).
There are 4500 such numbers.
500 or so.