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3 x 3 = 9 (Not a prime ; Composite)
1 x 19 = 19 ( Prime)
3 x 7 = 21 (Note a prime: Composite)
5 x 5 = 25 (Not a prime ; Composite).
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Earn +20 ptsQ: Which number is prime 9 19 21 25?
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Which the the numbers 19 21 23 and 25 has the most factors?
The number 21 would be the answer. 19 and 23 only have two factors, 1 and themselves, as they are prime numbers. 25 only has 1, 25 and 5. 21 has 1, 21, 3 and 7 for 4 possible factors.
What is the prime number out of 21 23 and 25?
21 = 3 x 7, so it is not a prime number. 23 = 1 x 23, it does not have any other factors, so it is a prime number. 25 = 5 x 5, so it is not a prime number.
Which number has the most factors 19 23 21 25?
21
Is 13 15 17 19 21 23 25 27 29 prime numbers?
They are all prime numbers except for 15 21 25 and 27 which are composite numbers
A composite number between 25 and 35 has 19 as the sum of its prime factors. What number is it?
The prime factors of 34 are 2 and 17, and 2 + 17 = 19.
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