npm package: @stdlib/assert-is-composite
Description: Test if a value is a composite number.
Author: The Stdlib Authors
Latest version: 0.2.3

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<details>
  <summary>
    About stdlib...
  </summary>
  <p>We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.</p>
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</details>

# isComposite

[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] <!-- [![dependencies][dependencies-image]][dependencies-url] -->

> Test if a value is a composite number.

<section class="intro">

A **composite number** is defined as a positive integer value greater than `1` which has **at least** one divisor other than `1` and itself (i.e., an integer value which can be formed by multiplying two smaller positive integers).

</section>

<!-- /.intro -->

<section class="installation">

## Installation

```bash
npm install @stdlib/assert-is-composite
```

</section>

<section class="usage">

## Usage

```javascript
var isComposite = require( '@stdlib/assert-is-composite' );
```

#### isComposite( value )

Tests if a `value` is a composite number.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number-ctor' );

var bool = isComposite( 4.0 );
// returns true

bool = isComposite( new Number( 4.0 ) );
// returns true

bool = isComposite( 3.14 );
// returns false

bool = isComposite( -4.0 );
// returns false

bool = isComposite( NaN );
// returns false

bool = isComposite( null );
// returns false
```

#### isComposite.isPrimitive( value )

Tests if a `value` is a primitive composite number.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number-ctor' );

var bool = isComposite.isPrimitive( 4.0 );
// returns true

bool = isComposite.isPrimitive( new Number( 4.0 ) );
// returns false
```

#### isComposite.isObject( value )

Tests if a `value` is a `Number` object having a value which is a composite number.

<!-- eslint-disable no-new-wrappers -->

```javascript
var Number = require( '@stdlib/number-ctor' );

var bool = isComposite.isObject( 4.0 );
// returns false

bool = isComposite.isObject( new Number( 4.0 ) );
// returns true
```

</section>

<!-- /.usage -->

<section class="examples">

## Examples

<!-- eslint-disable no-new-wrappers -->

<!-- eslint no-undef: "error" -->

```javascript
var Number = require( '@stdlib/number-ctor' );
var isComposite = require( '@stdlib/assert-is-composite' );

var bool = isComposite( 4.0 );
// returns true

bool = isComposite( new Number( 4.0 ) );
// returns true

bool = isComposite( 10.0 );
// returns true

bool = isComposite( 7.0 );
// returns false

bool = isComposite( 3.14 );
// returns false

bool = isComposite( -4.0 );
// returns false

bool = isComposite( NaN );
// returns false

bool = isComposite( '0.5' );
// returns false

bool = isComposite( null );
// returns false
```

</section>

<!-- /.examples -->

<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->

<section class="related">

* * *

## See Also

-   <span class="package-name">[`@stdlib/assert-is-integer`][@stdlib/assert/is-integer]</span><span class="delimiter">: </span><span class="description">test if a value is a number having an integer value.</span>
-   <span class="package-name">[`@stdlib/assert-is-number`][@stdlib/assert/is-number]</span><span class="delimiter">: </span><span class="description">test if a value is a number.</span>
-   <span class="package-name">[`@stdlib/assert-is-prime`][@stdlib/assert/is-prime]</span><span class="delimiter">: </span><span class="description">test if a value is a prime number.</span>

</section>

<!-- /.related -->

<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->


<section class="main-repo" >

* * *

## Notice

This package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].

#### Community

[![Chat][chat-image]][chat-url]

---

## License

See [LICENSE][stdlib-license].


## Copyright

Copyright &copy; 2016-2026. The Stdlib [Authors][stdlib-authors].

</section>

<!-- /.stdlib -->

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<section class="links">

[npm-image]: http://img.shields.io/npm/v/@stdlib/assert-is-composite.svg
[npm-url]: https://npmjs.org/package/@stdlib/assert-is-composite

[test-image]: https://github.com/stdlib-js/assert-is-composite/actions/workflows/test.yml/badge.svg?branch=v0.2.3
[test-url]: https://github.com/stdlib-js/assert-is-composite/actions/workflows/test.yml?query=branch:v0.2.3

[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/assert-is-composite/main.svg
[coverage-url]: https://codecov.io/github/stdlib-js/assert-is-composite?branch=main

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[stdlib]: https://github.com/stdlib-js/stdlib

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[umd]: https://github.com/umdjs/umd
[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules

[deno-url]: https://github.com/stdlib-js/assert-is-composite/tree/deno
[deno-readme]: https://github.com/stdlib-js/assert-is-composite/blob/deno/README.md
[umd-url]: https://github.com/stdlib-js/assert-is-composite/tree/umd
[umd-readme]: https://github.com/stdlib-js/assert-is-composite/blob/umd/README.md
[esm-url]: https://github.com/stdlib-js/assert-is-composite/tree/esm
[esm-readme]: https://github.com/stdlib-js/assert-is-composite/blob/esm/README.md
[branches-url]: https://github.com/stdlib-js/assert-is-composite/blob/main/branches.md

[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/assert-is-composite/main/LICENSE

<!-- <related-links> -->

[@stdlib/assert/is-integer]: https://www.npmjs.com/package/@stdlib/assert-is-integer

[@stdlib/assert/is-number]: https://www.npmjs.com/package/@stdlib/assert-is-number

[@stdlib/assert/is-prime]: https://www.npmjs.com/package/@stdlib/assert-is-prime

<!-- </related-links> -->

</section>

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