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#include <stdio.h>
#include <math.h>
int main()
{
int n;
scanf("%d", &n);
if (n <= 1) {
printf("False");
return 0;
}
for (int i = 2; i <= sqrt(n); i++) {
if (n % i == 0) {
printf("False");
return 0;
}
}
printf("True");
return 0;
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