the number 90 has the most factors under 100
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There are four odd numbers less that 100 that have 6 factor. This does not compare with even numbers that have 12 factors!
81 is the largest square of a whole number...
The most factors any odd number less than 100 has is 6. There are 4 numbers which have 6 factors:45, 63, 75 & 99.
The square of any prime number has exactly three factors: 22, 32, 52, etc.
There is no whole number less than zero.