The largest prime factor of 42 is 7
5 is the largest prime factor of 100. Prime factors of 100 are 2 x 2 x 5 x 5
38 is a composite number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
The proof that there is no largest prime:Assume that there are a finite number of primes for the sake of contradiction. Then, there should be a number P that equals p1p2p3...pn+1. P is either prime or not prime (composite). If it is prime, we just show that P is larger than the largest prime in the list. If it's not prime, it must be composite. Composite always has at least one factor that is prime, but since P is not divisible by any prime in the list, the unknown prime factor(s) must be something not in the list, this also shows that there is a prime larger than the largest prime in the list. Both cases show that no matter how large a list of prime numbers, there will be always at least one larger prime outside of that list.
No. 36 is composite and so it cannot be a prime factor.
The largest prime factor of 38 is 19.
19
2
Considering that 100 = (2^2)*(5^5) and 38 = (2^1)*(19^1), we can see that 2 is the greatest common prime factor between 100 and 38. If the question meant the greatest prime factor of either 100 or 38, then the answer is 19.
The largest prime factor of 92 is 23.
The largest prime factor of 1,505 is 43.
The largest prime factor of 93,093 is 31.
The largest prime factor of 42 is 7
The largest prime factor of 4,110 is 137.
The largest prime factor of 8,091 is: 31
The largest prime factor of 1,996 is 499.
The largest prime factor of 358 is 179.