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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.

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10y ago
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Q: What 4 prime numbers do you multiply to get 245?
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