Math.java

public class Math {
    public static boolean isPrime(final long number) {
        if (number == 2)
            return true;
        if (number < 2)
            return false;
        if(number % 2 == 0)
            return false;
        
        long maxCheck = (long) Math.sqrt(number);

        for (long i = 3; i <= maxCheck; i += 2) {
            if (number % i == 0)
                return false;
        }
        return true;
    }
}