Help me with this program

Question

I recently mad a program with python that determines wether or not the input is a prime number or not.
It works really well, but when I type in some numbers like 8 or 15, it says they are a prime number.
someone help me!

https://code.sololearn.com/cMlFgMfLpM7V/?ref=app

Answer 1

see this
https://code.sololearn.com/cDCA7AwyNdA3/?ref=app

Answer 2

arg... I made a stupid mistake.
Thanks for your help!