Problem 1: Write a program that inputs an integer in the range [-32767, 32767] from the Serial Monitor and checks to see if that number is a prime number. If the number is a prime number, have the LED on pin 13 turn on. If not, then turn the LED off.
--Do the actual prime number checking in a function.
--You may display the result of the check on the Serial Monitor.
--Carefully comment your code.
--Suggest ways to make the code more ecient.
HINT: You may wish to consult a resource to eciently test for a number being prime.