using System;
namespace TestCSharpConsole {
class Program {
static void Main(string[] args) {
for(int i = 2; i <= 100; i++) {
if(i == 2) {
Console.WriteLine(i + "is a prime number.");
continue;
}
for(int j = 2; j <= (int)(Math.Sqrt(i)) + 1; j++) {
if(j == (int)(Math.Sqrt(i)) + 1 && (i % j != 0)) {
Console.WriteLine(i + "is a prime number.");
}else if(i % j == 0) {
break;
}
}
}
}
}
}
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