That's an infinite list. 210 is on it.
47 does not have 4 prime numbers (factors or divisors).
210 is the number whose prime factors are the first four primes unrepeated.
420 has four prime factors. Prime factors don't usually travel in pairs.
Every product of two prime numbers has four factors.
39 is not a prime number because it has four factors: 1,3,13,39 and because prime number are numbers who has 2 factors.
420 has 5 prime factors, four of which are different prime numbers. Prime factors of 420 are 2 x 2 x 5 x 3 x 7.
The prime factors of 84 are 2, 2, 3, and 7.
All numbers have factors. Some factors are prime numbers. These are known as prime factors. Some numbers have some of the same prime factors as other numbers. These are known as common prime factors. 3 is a common prime factor of 12 and 15.
Some factors are prime numbers.
Prime factors are factors that are also prime numbers.
All numbers have factors. Some factors are prime numbers. These are known as prime factors.
Prime factors of numbers are small numbers that the bigger (original) number can divide by. The prime factors have to be prime. This means they only have two factors, itself and one.