Which ones are prime numbers

53

54

59

60

53 and 59 are prime numbers.

54 and 60 are not prime numbers.

Which of this answer choice is a prime number

8

12

13

15

17

13 and 17 are prime numbers.

How many times bigger is a group of 36 marbles than a group of 6 marbles?

A group of 36 marbles is 6 times bigger than a group of 6 marbles.