19 is a Prime number.
19 is a prime number.
19 is a prime number.
19 is a prime number.
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It is prime. There is an online calculator which can help you to understand a number is prime or not. And it has lots of other abilities. Use it: prime-calculator dot com
97 is a prime number.
No..... 33/11=3 thus it is a composite number
21 is composite.
15 is composite number 17, 19 and 23 are prime numbers.
13 and 19 are prime. 33 and 45 are composite.