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By definition, a Prime number has exactly two factors. So, there are no prime numbers with exactly three factors.

Q: What are all the numbers less than 100 with exactly 3 factors that are prime?

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Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.

Just 32.

The prime factors of 1955 are 5, 17, and 23. 5 x 17 x 23 = 1955

Just 36.

The prime factorization of the LCM will contain all the prime factors of the two original numbers. When the original numbers don't have any prime factors in common, (the GCF is 1) the LCM will be their product. When the two original numbers have prime factors in common (the GCF is 2 or more) the duplicates will be discarded and the LCM will be less than their product.

Related questions

4, 9, 25 and 49 They are squares of prime numbers.

Every prime number has exactly two factors. They are '1' and the number itself. There are 15 prime numbers less than 50. A few of them are 2, 3, 5, 7, 11, 13, and 47.

Numbers can be checked to see if they are primes simply by factoring them. Every prime number has exactly two factors, 1 and the number itself. If there are more or less than 2 factors, the number is not a prime. 1 has only one factor so it is not a prime, and composite numbers have 3 or more factors.

Composite numbers have more than two factors. So, the numbers which have two or less than two factors are not composite numbers. Numbers which have exactly two factors are prime numbers. 1 is an exceptional case because it is neither prime nor composite since it has only one factor which is 1.

4, 9, 25, and 49

prime squares 4, 9, 25, 49

Nothing special. They are squares of prime numbers.

Prime squares, like 4, 9, 25 and 49

Prime squares like 4, 9, 25, and 49.

Prime numbers

The set of prime factors of the numbers from 1 to 15,000 would be the set of prime numbers between 1 and 15,000. The link below has a list of the first 10,000 prime numbers, so if you take the primes less than 15,000, you will have the set of prime factors of the first 15,000 numbers. For prime factors of individual numbers, check the related question, "What are the prime factors of the numbers from 1 to 200?" Also check for WikiAnswers questions in the form of "What are the prime factors of __?" and "What are the factors and prime factors of __?"

All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.