25
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1,4,9,16,25,36,49
The first five perfect squares are: 1, 4, 9, 16, 25
All five digit numbers have three digits. The smallest five digit whole number is 10,000
The first five two-digit prime numbers are 11, 13, 17, 19, and 23.
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.