alleryA composite number with exactly two prime factors is called what?
AA twin-prime pair
BA perfect number
CA semiprime number
DA coprime number
Answer & Solution
Correct answer: C. A semiprime number
1. Count the prime factors, repeats included.
2. A composite number with two prime factors is a semiprime.
3. Example: 15 = 3 x 5 and 9 = 3 x 3 are both semiprimes.
_Source: Wikipedia, Composite number, section Types_
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