17 lines
402 B
C++
17 lines
402 B
C++
#include <stdio.h>
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#include <math.h>
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int main(){
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int i, n, m, c = 1, flag;
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while(scanf("%d", &n), n > 0){
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m = sqrt(n);
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for(i = 2; i <= m + 1; i++){
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if(n % i == 0){flag = 0; break;}
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else flag = 1;
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}
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if(n == 1) flag = 0;
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if(flag) printf("%d: yes\n", c++);
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else printf("%d: no\n", c++);
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}
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return 0;
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}
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