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Even if that was 2 x 4 x 5, it wouldn't be a prime factorization because 4 isn't a Prime number. The full prime factorization of 40 is 2 x 2 x 2 x 5.
As a product of its prime factors: 5*7*7 = 245
A prime factorization
The product of the prime factors of 26 is the composite number 26.
As a product of its prime factors: 2*2*1213 = 4852
The prime factorization of 245 is 5 x 7 x 75 x 7 x 7 = 2455 x 7 x 7 = 245The process of prime factorisation is one of repeated division by primes, while obtaining a quotient without a remainder, until the process yields a quotient of 1 245 is not divisible by 2 or by 3245 ÷ 5 = 49 ................................. 5 is a prime factor of 24549 is not divisible by 549 ÷ 7 = 7 ..................................... 7 is a prime factor of 2457 ÷ 7 = 1 ....................................... 7 is a prime factor of 245 So the prime factors of 245 are 5, 7 and 7