素因数(そいんすう)

そいんすう
noun
prime factor
academicnumber
1. prime factor
A prime number that divides a given whole number exactly. Learned in Japanese middle school, chiefly in the phrase 素因数分解(そいんすうぶんかい) (prime factorization).
十二(じゅうに)の素因数(そいんすう)は二(に)と三(さん)だ。
The prime factors of 12 are 2 and 3.
この数(かず)を素因数(そいんすう)分解(ぶんかい)しなさい。
Factor this number into its prime factors.
大(おお)きな数(かず)の素因数(そいんすう)を求(もと)めるのは難(むずか)しく、その性質(せいしつ)が暗号(あんごう)に使(つか)われている。
Finding the prime factors of a large number is difficult, and that property is used in cryptography.

A mathematics term; in ordinary conversation it appears only when talking about school maths.

Common collocations

Similar words

  • 素数(そすう): prime number — a prime in its own right, not necessarily a factor of anything
  • 約数(やくすう): divisor — any number that divides evenly, prime or not

Related Words

Compare: 素数(そすう) (prime number)
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Added 2026.7.26 3:20 · Revised 2026.9.2 13:02
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