Editing Semiprime (section)

{{Short description|Product of two prime numbers}}
In [[mathematics]], a '''semiprime''' is a [[natural number]] that is the [[Product (mathematics)|product]] of exactly two [[prime number]]s. The two primes in the product may equal each other, so the semiprimes include the [[Square number|squares]] of prime numbers.
Because there are infinitely many prime numbers, there are also infinitely many semiprimes. Semiprimes are also called '''biprimes''',<ref>{{cite OEIS|A001358}}</ref> since they include two primes, or '''second numbers''',<ref>{{Citation |last=Nowicki |first=Andrzej |title=Second numbers in arithmetic progressions |date=2013-07-01 |arxiv=1306.6424 }}</ref> by analogy with how "prime" means "first".