The isPrime(int n) method is used to check whether the parameter passed to it is a prime number or not. If the parameter passed is prime, then it returns True otherwise it returns False. If the number is less than 1, if(inputNumber<= 1) it returns false.

What is prime Java?

Prime number in Java: Prime number is a number that is greater than 1 and divided by 1 or itself only. In other words, prime numbers can’t be divided by other numbers than itself or 1. For example 2, 3, 5, 7, 11, 13, 17…. are the prime numbers.

How do you write an isPrime in Java?

1. public static boolean isPrime(int num) { if (num <= 1) {
2. return false; }
3. for (int i = 2; i <= Math. sqrt(num); i++) { if (num % i == 0) {
4. return false; }
5. } return true;
6. }