src/IntType.php
public function isPrime()
    {
        if ($this->value < 2) {
            return false;
        }

        if ($this->value === 2) {
            return true;
        }

        if ($this->isEven()) {
            return false;
        }

        for ($i = 3; $i <= ceil(sqrt($this->value)); $i = $i + 2) {
            if ($this->value % $i == 0) {
                return false;
            }
        }

        return true;
    }
public function isPrime()
    {
        if ($this->value < 2) {
            return false;
        }

        if ($this->value === 2) {
            return true;
        }

        if ($this->isEven()) {
            return false;
        }

        for ($i = 3; $i <= ceil(sqrt($this->value)); $i = $i + 2) {
            if ($this->value % $i == 0) {
                return false;
            }
        }

        return true;
    }
public function isPrime ( ) { if ( $ this -> value < 2 ) { return false ; } if ( $ this -> value === 2 ) { return true ; } if ( $ this -> isEven ( ) ) { return false ; } for ( $ i = 3 ; $ i <= ceil ( sqrt ( $ this -> value ) ) ; $ i = $ i + 2 ) { if ( $ this -> value % $ i == 0 ) { return false ; } } return true ; }
Is this a prime?

@return boolean
Is this a prime?