public class Prime{
public static boolean isPrime(int num){
System.out.println(num + "的开方是:" + Math.sqrt(num));
boolean flag = true; //默认为素数
if(num < 2){
flag = false;
}else{
for(int i = 2; i<=Math.sqrt(num) ;i++){
if(num % i == 0){
flag = false;
}
}
}
return flag;
}
public static void main(String[] args) {
if(isPrime(6)){
System.out.println("是素数!");
}else{
System.out.println("不是素数!");
}
}
}