Java- nonstatic method cannot be referenced from a static context [duplicate]

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Yes, you cannot call a non-static method from a static context.
You have two options:

Declare primeNum () static:

static int primeNum (int x){

Create an instance of primeNum and call primeNum () via that reference:

PrimeNumClass primeNumObj = new PrimeNumClass();
int returnVal = primeNumObj.primeNum(x);

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