Question

Determine weather each number is prime or composite .
a) 649 b) 721

Answer 1

Answer:

649 = prime number.

721 =prime number

Step-by-step explanation:

Because there is 9 on digit's place of the number 649 and 9 is prime number so 649 is also a prime number.

Because there is 1 on digit's place of the number 721 and 1 is a prime number so 721 is a prime number.

conclusion : 649 and 721 are prime number.

Answer 2

Answer:

Hey!

649 is a composite number as it has factors 11 and 59 as well.

721 is also a composite number and it has factors 7 and 103.

Actually both of these numbers can also be called semiprime because all their factors are prime numbers.

I hope my answer helped you...