The smallest prime factor of 105 is 3.
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105 is not prime. 105 = 3 * 5 * 7
105 is a composite number because it has more than 2 factors
19 is the prime number.
19
105 is not a prime number, as it's factors are: 1, 3, 5, 7, 15, 21, 35, 105.