Numbers that have exactly 4 factors are known as semiprime numbers. Semiprime numbers are the product of two prime numbers, and since prime numbers only have two factors (1 and the number itself), the product of two prime numbers will have a total of 4 factors. Examples of semiprime numbers include 6 (2 x 3) and 15 (3 x 5).
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Numbers that have only 2 factors are prime numbers
They are 5, 7 and 11 which are all prime numbers
Prime numbers
Prime numbers have only two factors.
The only number that is a factor of all the numbers from 1 to 100 is the number 1. The only factor of 1 is 1. The factors of 2 are 1 and 2. The factors of 3 are 1 and 3. The factors of 4 are 1, 2, and 4. The factors of 5 are 1 and 5. The factors of 6 are 1, 2, 3, and 6. The factors of 7 are 1 and 7. The factors of 8 are 1, 2, 4, and 8. The factors of 9 are 1, 3, and 9. The factors of 10 are 1, 2, 5, and 10. The only common factor of these ten numbers is 1. Since all numbers are divisible by 1, the greatest common factor is 1.