4, 9 and 25.
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Numbers with exactly three factors are squares of prime numbers.
4? the factors of 4 are 1,4 and 2
Numbers with three factors are squares of primes. So: 4, 9, 25
The LCM of the given three numbers is 24
Assuming that 001, 080, etc are not allowed (that is a leading zero or two is not permitted), the smallest number with exactly three digits is 100. The largest number with exactly three digits is 999. So there are 999 - 100 + 1 = 900 numbers with exactly three digits.