[root@aaa1 nsr]# cd /opt/lgtonmc/cores/gstd/

[root@aaa1 gstd]# ls -ltr

total 1008712

-rw------- 1 root root 1091633152 Dec 18  2015 core.2395

-rw------- 1 root root  830509056 Apr 13 11:05 core.5706

-rw------- 1 root root  759316480 Jun 29 06:00 core.5730

Can someone explain what are the above files can we delete it??