3道C语言编程题，希望你们能帮助我

1. #include int main() { int n,m,count=0; scanf("%d",&n); m = n; while(m%2==0) m/=2; while(m%3==0) m/=3; while(m%5==0) m/=5; while(m%7==0) m/=7; if(m!=1) { printf("no\n"); return 0; } for(m=1;m<=