Decompose 60, 105 and 240 into prime factors and find out the same prime factor 60= 105= 240=

60 = 2 * 2 * 3 * 5 105 = 3 * 5 * 7 240 = 2 * 2 * 2 * 2 * 3 * 5 the same is 3 and 5

18 = 2 * 3 * 3, so the prime factors of 18 are 2 and 3

Yes, prime factor means that the factor is prime, and prime number means that only 1 and itself are factors after decomposition
The factors are 1,18,2,9,3,6, but the prime factor is only 2.3

18 = 2 × 3 × 3 × 1, right

18=2×3×3
1 is not prime

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