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#include<bits/stdc++.h> using namespace std; int main(){ int a; cin>>a; int s=1; if(a2) cout<<"Yes"; else if(a1) cout<<"No"; else{ for(int i=2;i<sqrt(a);i++){ if(a%i==0){ s=0; break; } } if(s) cout<<"Yes"; else cout<<"No"; } }

#include<iostream> using namespace std; int main(){ long long n; cin>>n; if(n1||n0){ cout<<"No"; return 0; } for(int i=2;i<=n/i;i++){ if(n%i==0){ cout<<"No"; return 0; } } cout<<"Yes"; }

#include<bits/stdc++.h> using namespace std; int sushu(int x){ if(x == 1) return false; for(int i = 2;i * i <= x;i++) if(x % 2 == 0) return false; return true; } int main(){ int n; cin >> n; if(sushu(n)) cout << "Yes"; else cout << "No"; return 0; }