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No. All three are not prime numbers. A Prime number is a number that is only divisible by itself and 1. 15 can be divided by 1, 3, 5 and 15 16 can be divided by 1, 2, 4, 8 and 16 18 can be divided by 1, 2, 3, 6, 9 and 18.
What else can I help you with?
Which of these is a prime number 16 17 18 15?
a prime number that's ONLY multiples are itself and 1. example:4*4=16 3*5=15 9*2=18 1*17=17
What is the prime factors of 18 and 15?
Prime factors of 18 are 2 and 3 Prime factors of 15 are 3 and 5
What pair of numbers between 200 and 300 has a gcf of 18?
To have a gcf of 18 they must have one factor of 18 in common and no other factor, ie the second factor of the numbers must be relatively prime. The multiples of 18 between 200 and 300 are: 12 x 18 = 216 13 x 18 = 234 14 x 18 = 252 15 x 18 = 270 16 x 18 = 288 12 is relatively prime to 13 13 is relatively prime to 14, 15 & 16 14 is relatively prime to 15 15 is relatively prime to 16 (Pairs of numbers are being considered, so as 12 is relatively prime to 13, 13 is also relatively prime to 12 and thus is only listed when the numbers increase, ie under 12 and not under 13.) Thus the pairs: 216 & 234 234 & 252 234 & 270 234 & 288 252 & 270 270 & 288 all have a gcf of 18.
How many integers between 13 and 19 inclusive have an even number of prime factors?
13 is prime 14=2x7, 2 factors 15=3x5, 2 factors 16=24, 4 factors 17 is prime 18=2x32, 3 factors 19 is prime So the answer is 3 (14, 15 and 16)
What is the odd number between 10 and 20that are not prime number?
The numbers between 10 and 20 that are not prime are 12, 14, 15, 16 and 18. So 15 is the odd number and the rest are even numbers.
Which is a prime number 16 21 19 18?
19 is prime.
Is 15 a prime factor of 225?
15 is not a prime number, so it can't be a prime factor.
Is 18 and 16 a co-prime number?
No.
What are the prime factorization for 16 and 18?
its 36
What are the first 10 composite prime numbers?
They are: 4 6 8 9 10 12 14 15 16 18.
What numbers are not prime 1-20?
4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20
What is the highest power of each prime factor of 18 and 15?
The prime factors of 15 are 3 and 5. The prime factors of 18 are 2 and 3. The highest power of each of these is 1.
