Simple function in Prolog

I want to write such a function in PROLOG that when i run hulk(2,P)  in the terminal , it gives me :
NO  
I write the code as below. BUt it doesn't work.
hulk(2,P) :- P is NO.

I tried also below
hulk(2,P) :- P is [NO].
But it doesn't work.
When i compiled it , I take the warning:
Warning: /home/samil/hw6.pl:1:
      Singleton variables: [No]

WHen i run it , i take the error:
ERROR: is/2: Arguments are not sufficiently instantiated
HOw to do it?
codeBuilderAsked:
Who is Participating?
 
fridomCEO/ProgrammerCommented:
Try:
hulk(X,P) :-
       writef('NO'), nl.

call it with:

X=2, hulk(X,P).
false.
0
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