composite number

合数

Number Theory · Undergraduate · Mathematics Resources editorial compilation (AI-assisted)

Translation evidence: Literature usage

Meaning in context

An integer $n>1$ having a positive divisor strictly between $1$ and $n$.

存在严格介于 $1$ 与自身之间的正因数的大于 $1$ 的整数。

Example

$21=3\cdot7$ is composite.

Usage and distinctions

Zero, one and negative integers are outside this positive-integer classification.

Recommended reading in this subject · Preparation & skip guidance

Definition sources

1. Thomas W. Judson — Abstract Algebra: Theory and ApplicationsSubsection 2.2.2, composite definition after prime definition · Checked 2026-10-14

Translation sources

1. 新乡学院数学与统计学院 — 初等数论课程教学大纲第一章 整数的可除性，基本概念段落 素数与合数，PDF page 2 (zero-based index 1); name evidence only · Checked 2026-10-15

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