How do I factor this? Please explain the steps

What is the prime factorization of 23 ?me with this question

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?

With alll of except for the 2 that i did already