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It is19 because it has only two factors
No: 105 and 128 are both composite numbers because they have more than two factors
105 is the sum
105 is the sum
The prime factors of 105 are: 3,5,7
The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105.
The factors of -105 are 1, 3, 5, 7, 15, 21, 35, 105 and their negatives. The prime factors are 3, 5 and 7
The prime factors of 105 are 5, 3 and 7. So to work out which two numbers have 105 as an LCM, we just have to share these factors between the two numbers, and add in any duplicates we want. For instance: 5x3 = 15 3x7 = 21 So 15 and 21 have a LCM of 105. 7x5 = 35 3x5 = 15 So 35 and 15 have a LCM of 105. And so on.
The factors of 49 are: 1, 7, 49 The factors of 105 are: 1, 3, 5, 7, 15, 21, 35, 105
All Factors of 105: 1, 3, 5, 7, 15, 21, 35, 105.
All Factors of 105: 1, 3, 5, 7, 15, 21, 35, 105.