Qbasic to find prime or composite using Sub

DECLARE SUB PRIME (N)
INPUT "Enter any number"; N
CALL PRIME (N)
END


SUB PRIME (N)
C = 0
FOR I = 1 TO N
IF N MOD I = 0 THEN C = C + 1
NEXT I
IF C = 2 THEN
PRINT N; "IS PRIME NUMBER"
ELSE
PRINT N; "IS COMPOSITE NUMBER"
END IF
END SUB