The squares of all prime numbers have exactly 3 factors. The numbers under fifty that are the squares of primes are 4 (1, 2, and 4), 9 (1, 3, and 9), 25 (1, 5, and 25), and 49 ( 1, 7, and 49).
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Prime numbers have only two factors.
6, 8, 10, 14, 15, 21, 22, 26, 27, 33, 34, 35, 38, 39, 46 have exactly four factors.
2 and 5. The factors of 50 (i.e., the whole numbers that evenly divide into 50) are 2, 5, 10, 25, and 50. Of these numbers, only 2 and 5 are prime numbers.
A number greater than 50 with only 2 prime factors would be a semiprime number. Semiprime numbers are products of exactly two prime numbers. An example of a semiprime number greater than 50 would be 77, which is the product of the prime numbers 7 and 11.
The factors of all of the numbers from 1 to 100 are all of the numbers from 1 to 50.