The first language of this board is English and since I don't recognise the language you are posting in I can not try to get it translated, I suggest that you repost your question in English.
Google tells me the language is Indonesian and that "bilangan prima" = "prime number".
Budiman: forgetting about programming for a moment, consider how you would determine if a particular number is prime using pencil and paper. You need a firm grasp on the algorithm before you try to translate it into code.
I am closing this thread as it is 3 years old. vannthns please do not resurrect threads this old unless they happen to be your own and you wish to continue the topic.
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