Prime number/safe puzzle is wrong!!!

[Ebony Messmer]

The clue says the 4th number is the only one that is not a prime number. Therefore all the others must be, leaving the other 4 digits as either 2, 3, 5 or 7. You put a bloody 1 in there!! 1 is not a Prime number, this puzzle made me use the walkthrough due to your bad maths skills!! (after about 30 mins of saying it was impossible for that to be the combination, even though it was the only solution!
A prime number (or a prime) is a natural number that has exactly two distinct natural number divisors: 1 and itself. For example, there are 25 prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97.

[Kirbyroth]

maybe you misread it or dev changed that part i didnt have trouble with it

[spiritworld]

I feel your pain, anyway I got it right quite fast bcz something (=overall bad quality of this game) made me think "maybe they used 1 ... or even, godforbid, zero here".

Originally posted by Kirbyroth:

i didnt have trouble with it

Of course you didn't if you don't know what are prime numbers :D 1 is not prime number.