Revision as of 17:05, 25 January 2020 by Duck master (talk | contribs) (Put more information about semiprimes.)

In mathematics, a semiprime is a number that is the product of two not necessarily distinct primes. These integers are important in many contexts, including cryptography.


  • $9$ is an example of a semiprime as it is the product of two threes. $3*3=9$.
  • $10$ is also an example as it is obtained by $5*2$.

Other examples include: $25$, $15$, $39$, $221$, $437$, and $1537$.

Examples of non-semiprimes

  • $17$, as it is only a prime number.
  • $12$, not a semiprime because it can obtained by $3*4$ or $2*6$.

See Also

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