diff --git a/230B T-primes/230B.cpp b/230B T-primes/230B.cpp
new file mode 100644
index 0000000..a130459
--- /dev/null
+++ b/230B T-primes/230B.cpp	
@@ -0,0 +1,41 @@
+#include <bits/stdc++.h>
+using namespace std;
+using ll = long long;
+
+void solve()
+{
+    ll N = 1e6;
+    vector<bool>prime(N+1,1);
+    prime[0]=prime[1]=0;
+    for (ll i = 2; i * i <= N; ++i)
+    {
+        if (prime[i])
+        {
+            for (ll j = i*i; j <=N; j+=i)
+                prime[j]=0;
+        }
+    }
+    ll n;
+    cin>>n;
+    while(n--)
+    {
+        ll x;
+        cin>>x;
+        ll r= sqrt(x);
+        if(r*r!=x) cout<<"NO"<<endl;
+        else if(prime[sqrt(x)]) cout<<"YES"<<endl;
+        else cout<<"NO"<<endl;
+    }
+}
+
+int main()
+{
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    int TC = 1;
+    // cin >> TC;
+    // cin.ignore();
+    while (TC--)
+        solve();
+}
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