ulamspiral | Python code to generate and print Ulam Spirals | 3D Printing library

I got a challenge to make a Ulam Spiral in Java, but before the Ulam Spiral is created, the user should put in 2 numbers. Those 2 numbers should be checked so they aren't a prime number. As long as one of the numbers that are written is a prime number, then the program should restart and ask for 2 new numbers.

The getInput method is asking the user for 2 numbers. After that those numbers are written, the isPrime method should be called and one number at a time should be checked if it's a prime. If the first number checked isn't a prime, then the second number should be checked, if that also isn't a prime, then the next method should be called. What I don't understand is the isPrime method I have. It checks the number, but how do I make so if the first isn't a prime, then check the next number and as long as none of them are prime, then we are fine. I could make that the isPrime method takes in both numbers and they are checked, but I was not allowed to do that, I must check one number at a time.

Here you see my getInput and isPrime method. And yes, I know that isPrime(firstNumber); isPrime(secondsNumber); in my main method is weird and it shouldn't be like that, should it? is it a better way?