Question: what is the largest prime number that is a factor of 28?
Answer: = 2 x 2 x 7 are the prime factors of 28. = 2 x 2 x 7 are the prime factors of 28. Two (2) and seven (7) are prime numbers because each satisfies the definition of a prime number. A prime number is a positive integer that is exactly divisible (a zero remainder) by exactly TWO positive integers: itself and 1.