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The prime factors of 16 are 2, 2, 2, and 2. It has four prime factors, but only one distinct prime factor.

The prime factors of 24 are 2, 2, 2, and 3. It has four prime factors, but only two distinct prime factors.

The prime factors of 36 are 2, 2, 3, and 3. It has four prime factors, but only two distinct prime factors.

The prime factors of 40 are 2, 2, 2, and 5. It has four prime factors, but only two distinct prime factors.

The prime factors of 54 are 2, 3, 3, and 3. It has four prime factors, but only two distinct prime factors.

The prime factors of 56 are 2, 2, 2, and 7. It has four prime factors, but only two distinct prime factors.

The prime factors of 60 are 2, 2, 3, and 5. It has four prime factors, but only three distinct prime factors.

The prime factors of 81 are 3, 3, 3, and 3. It has four prime factors, but only one distinct prime factor.

The prime factors of 84 are 2, 2, 3, and 7. It has four prime factors, but only three distinct prime factors.

The prime factors of 88 are 2, 2, 2, and 11. It has four prime factors, but only two distinct prime factors.

The prime factors of 90 are 2, 3, 3, and 5. It has four prime factors, but only three distinct prime factors.

Q: What number less than 100 has exactly 4 prime factors?

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

105=3*5*7it has to be only three factors and they are all prime105

512 = 29 or 768 = 28*3 have 9 prime factors each.

15

It would be 13, since the definition of a prime number is "Any number who's only factors are one and itself".

Related questions

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

How about 105 whose prime factors are 3, 5 and 7

105

27

The square of any prime number has exactly three factors: 22, 32, 52, etc.

I found 105,63 and 27

How about 30 or 105

105 is one such number.

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.

Nothing special. They are squares of prime numbers.

105 and the primes are 3, 5, and 7