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Eight - all the prime numbers (the definition of which is a number with exactly two different factors) which are 2, 3, 5, 7, 11, 13, 17, 19.
It could be argued that any number with 3 or more different factors has 2 different factors (along with one or more other factors), which means all numbers less than 20 except 1 have two different factors, ie the 18 numbers 2-19; these numbers just don't all have exactly two different factors.
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What number below 160 has exactly 3 prime factors?
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
What is the prime factor of 1.06?
Prime factors refer to integers, not decimals.
What is a whole number when it has exactly 2 factors?
A prime number has exactly two factors: itself and 1.
How many natural numbers less than 1000 have exactly three distinct positive integer divisors?
Prime squares have three factors. There are 11 of them in that range.
What are the factors of 1.01?
Factors of 101 are 1 and 101. So, it is a prime number.
