Checking Prime in java

      public class Prime {

            public boolean isPrime(int n) {

                  if (n < 2) {

                      return false;

                  }

                  if (n == 2) {

                      return true;

                  }

                  if (n % 2 == 0) {

                      return false;

                  }

                  int sqrt = (int) Math.sqrt(n);

                  for (int i = 3; i <= sqrt; i += 2) {

                        if (n % i == 0) {

                           return false;

                        }

                  }

                  return true;

            }

      }