A prime number has exactly two factors: itself and 1.
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The number is 2.
64
A Whole number is a set of natural numbers and zero like the number 1 2 3 4 or 5
A factor is a whole number which divides exactly into a whole number, so for 450 it would start1 & 4502 & 2253 & 1505 & 90etc, work up until you start repeating numbers you've already had
There is no such number. Any prime number raised to the third power has exactly four factors. For example, 23 = 8; its factors are 1, 2, 4, 8 (1, 2, 22, 23). Since - as is well-known - there is no largest prime number, there is no largest number that has exactly four factors.