If you have an IR6 green card and have also received an I-751, it means that you initially received a conditional permanent resident status based on your marriage to a U.S. citizen, and you have successfully filed Form I-751 "Petition to Remove Conditions on Residence" to remove the conditional status and become a full permanent resident with an IR6 green card, which specifically applies to spouses of U.S. citizens; essentially, you are now able to live and work in the United States permanently without restrictions related to your conditional residency.
Key points to remember:
IR6 green card:
This signifies that your permanent residency is based on your spouse being a U.S. citizen.
I-751 form:
This is the form used to remove conditions on a conditional permanent resident status usually obtained through marriage.
Good luck 👍