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It is 7 because it has only two factors which are itself and one

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Q: What is the prime number for 4 6 7 8 15 21?
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Related questions

Are 4 and 21 relatively prime?

Yes, 4 and 21 are relatively prime. Numbers that are relatively prime only have the number 1 as a common factor. That is the case with 4 and 21.


What is a number that isn't a prime number?

1, 4, 6, 8, 9, 12, 14, 15, 16, 18, 20, 21, 22...


Is there a prime number that is a multiple of 21?

No, it is not possible. Every multiple of 21 is a composite number. 21 is a composite number and its factors are 1, 3, 7 and 21(4 factors). Any multiple of 21 must have all the factors of 21. So, every multiple of 21 has at least 4 factors. And a prime number has only two factors so, any multiple of 21 can't be prime.


Which one of these are prime numers 21 47 87 or 4?

47 is a prime number 21 & 87 divisible by 3, and 4 is divisible by 2


Wihch is a prime number 4 13 26 15?

A prime number can only be divided by itself and 1. 4 can be divided by 2 26 can be divided by 2 15 can be divided by 3


What is the prime number 4 6 7 8 15 21?

The prime number is 7, because the only factors for 7 are 1 and 7.


What prime number between 40 and 60 is 4 greater than another prime?

40/4=10 60/4=15 Then the second prime are between 10 and 15, two prime numbers: 11 and 13 The prime number is between 44 and 52 : 47


Why is 19 a prime number but 15 is not a prime number?

19 only has 2 factors - itself and 1. 15 has 4 factors - itself, 1, 3, and 5. Prime numbers can only have 2 factors. 19 is prime, 15 is composite.


What number is a prime factor of both 12 and 21?

'3' 3 x 4 = 12 3 x 7 = 21 NB '7' is also a prime number.


What is the next number in the number pattern 3 6 10 15?

21: (3)+3=(6)+4=(10)+5=(15)+6=(21)


Is it possible to have a prime and triangular number result when you roll 4 dice?

First few triangular numbers: 0, 1, 3, 6, 10, 15, 21, 28 Numbers that can be thrown with four dice: 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 Which of these numbers that are triangular: 6, 10, 15, 21 None of these is prime.


What date is not a prime number between 1 31?

4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30