希望大佬指点 后六个WA 试了一下 和正确代码的有个数据点：（1，1000000000000）答案不一样

#include<stdio.h>
#include<math.h>
const int mod=998244353;

int main(){
	signed long long L,R;
	scanf("%lld  %lld",&L,&R);
	signed long long i=L;
	signed long long product=1;
	int found=0;
	for(i=sqrt(L);i<=sqrtl(R);i++){
		if(i*i<L)continue;
		if(i*i>R)break;
		int t=i*i;
		int a=t;
		long long sum=0;
		while(a){
    	sum+=a%10;
    	a/=10;
		}
		long long j=0;
		if(sum<2) continue;
    	for(j=2;j<=sqrtl(sum);j++) if(sum%j==0) goto over;
	    product=((product%mod)*(t%mod))%mod;
	    found=1;
	    over:continue;
	}

    if(!found) printf("0");
    else printf("%lld",product);
    return 0;
}