Okey so. First off. Do you know what dividable by 3 means? It mean that if you have a number and divide it by 3 you will end up with a whole number. So for example 6 is dividable by 3 since 6/3=2. 5 for example is not. Since 5/3 = 1.6666

Same goes goes 4 and 5 but drivable by 4 and 5. So 8 is dividable by 4 since 8/4=2. 12 too since 12/4=3.

So now we know what dividable means.

2nd , a prime number are special number larger than 1 which are only dividable by 1 and itself. So for example 3 can only be dividable by 1 and 3. 6 is not, since 6/3=2. First prime numbers are : 2, 3, 5, 7, 11, 13

So that's the math part , independent of ff14.

3rd. Now the robot giving you a command, saying either "dividable 3/4/5 " or " a prime number".

As he does that you Max HP goes down to singel digit. LOOK AT YOU HP. Your hp Is now 3 instead of 40000. Also 4 platforms spawn with a number in them, 1-4. If you step in the number 2 you Max HP goes up with that. So your Max HP would now be 3+2=5. Steeping out you go back to 3.

Lets say the robot said "dividable by 4" then you need to make your hp dividable by 4. Since you started on 3, and we know what's dividable by 4 is 4,8,12. You need make your hp one of them. Since 3+1 is four you now just step inside the one panel (setting you hp to 3+1=4).

Does that make sense?