Are 2 forever stamps enough to mail a letter

In the United States, the cost of mailing a letter depends on the weight and size of the letter, as well as the destination.

As of 2022, the current rate for a First-Class Mail letter is:

So, to answer your question:

Keep in mind that these rates are subject to change, so it's always a good idea to check the current rates with the United States Postal Service (USPS) before mailing your letter.

Additionally, if you're mailing a letter to a destination outside the United States, the rates and requirements may be different.