A number with exactly five factors is a number that is a prime number raised to the fourth power (p4). The factors are 1, p, p2, p3, and p4.
Examples:
The 5 factors of 24 = 16 are 1, 2, 4, 8, and 16.
The 5 factors of 34 = 81 are 1, 3, 9, 27, and 81.
The 5 factors of 54 = 625 are 1, 5, 25, 125, and 625.
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There are three of them with exactly five factors.
There are five numbers in that range with 12 factors, but none with exactly eleven.
Squares of prime numbers have exactly three factors.
Prime numbers have exactly two factors.All prime numbers have only 2 factors whereas composite numbers have more than 2 factors
That is correct -- all prime numbers have exactly two factors.