# Function isPrime Test whether a value is prime: has no divisors other than itself and one. The function supports type `number`, `bignumber`. The function is evaluated element-wise in case of Array or Matrix input. ## Syntax ```js math.isPrime(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | number | BigNumber | Array | Matrix | Value to be tested ### Returns Type | Description ---- | ----------- boolean | Returns true when `x` is larger than zero. Throws an error in case of an unknown data type. ## Examples ```js math.isPrime(3) // returns true math.isPrime(-2) // returns false math.isPrime(0) // returns false math.isPrime(-0) // returns false math.isPrime(0.5) // returns false math.isPrime('2') // returns true math.isPrime([2, 17, 100]) // returns [true, true, false] ``` ## See also [isNumeric](isNumeric.md), [isZero](isZero.md), [isNegative](isNegative.md), [isInteger](isInteger.md)