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245 = 5 x 7 x 7
There are only 3 prime numbers in its factorisation, with one repeated.
A Prime number is any number with exactly two distinct (different) factors (namely 1 and itself); the number 1 only has the factors of 1 and itself, but itself being 1 is not different from the 1, so it NOT a prime number.
There are 4 of them which are 2*3*3*3 = 54
There can only be 3 of them because as a product of its prime factors: 5*5*5 = 125
2)490 5)245 7)49 7)7 = 1 When reduced to '1' Then the four numbers are 2,5,7,7. All prime numbers.
616
3 x 3 x 7 x 7