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The number 1 is neither prime nor composite. The numbers 25, 16, 21, and 27 are divisible by factors that are not one or the number itself. 19 is the only one that has only 1 and itself as factors, so it is a Prime number.
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Related Questions
Which is a prime number 16 21 19 18?
19 is prime.
What is the prime number of 16 27 13 19 21?
They are 13 and 19 which are prime numbers
Is 23 21 19 prime or composite?
19 is a prime number. Its only factors are 1 and 19. 21 is a composite number. Its factors are 1, 3, 7, and 21. 23 is a prime number. Its only factors are 1 and 23.
Which of these numbers are prime 13 16 19 21?
13 and 19.
Which one is a prime number 19 21 or 23?
19 and 23 are prime.
Which are prime numbers out of 16 27 13 19 and 21?
They are 13 and 19
Which number is a prime number 7 16 21 28 93?
7 is prime.
What are prime numbers 16 27 13 19 21?
13,19.
What is the largest prime number less than 21?
19
Which is not a prime number 17 19 or 21?
21 isn't because 7*3=21.
Which number is prime 9 19 21 25?
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).
Is 10 19 21 62 composite numbers?
19 is prime number. 10, 21 and 62 are composite numbers.
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