19 is already prime; no factorization.
1, 3, 213
2x2
No.
43 is already prime; no factorization required.
Prime Factorization: 2*5*31
3 x 71 = 213
No it isn't. 235/5 = 47 and 47 is a prim number. 235 isn't a prime number so it isn't a prim factorization. The real factorization is 47 * 5.
It is: 2*29 = 58
67 is a prime number
144 = 24 × 32
2 x 3