View Compilation Error

0_0_39716296_17164\Main.java:37: 错误: 需要class, interface或enum
        if (num <= 1) {
        ^
0_0_39716296_17164\Main.java:39: 错误: 需要class, interface或enum
        }
        ^
0_0_39716296_17164\Main.java:40: 错误: 需要class, interface或enum
        for (int i = 2; i * i <= num; i++) {
                        ^
0_0_39716296_17164\Main.java:40: 错误: 需要class, interface或enum
        for (int i = 2; i * i <= num; i++) {
                                      ^
0_0_39716296_17164\Main.java:43: 错误: 需要class, interface或enum
            }
            ^
0_0_39716296_17164\Main.java:46: 错误: 需要class, interface或enum
    }
    ^
6 个错误