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Oct 21st, 2019
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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. void prime(int n){
  5. int i;
  6. if(n < 2){
  7. printf("no\n");
  8. return;
  9. }
  10. for(i = 2; i*i <= n; i++){
  11. if(n % i == 0){
  12. printf("no\n");
  13. return;
  14. }
  15. }
  16. printf("yes\n");
  17. return;
  18. }
  19.  
  20. int main(){
  21. int n;
  22. scanf("%d", &n);
  23. prime(n);
  24. return 0;
  25. }
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