Which numbers out of 1, 2, 3, 5, 6, 10, 15 and 30 are prime numbers?

Answer 1

2, 3, 5

A prime number is a real number greater than 1 that is only divisible by 1 and itself. 2, 3, and 5 are only divisible by 1 and themselves. 6 is divisible by 1,2,3, and 6. 10 is divisible by 1,2,5,and 10. 15 is idvisible by 1,3,5, and 15. 30 is divisible by 1,2,3,5,6,10,15, and 30.

1 is not considered to be a prime number. Here's a reference:
http://primes.utm.edu/notes/faq/one.html

Hope this helps!

Answer 2

2 3 5

Answer 3

The Mathematical answer to your question is:-

2; 3 and 5 are Prime Numbers

The first 30 prime numbers are:
2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, and 113

Answer 4

Only 2, 3 and 5.
6 = 2*3
10 - 2*5
15 = 3*5
30 = 2*3*5
1 is not considered a prime number. If it
were the unique factorisation law for
whole numbers would no longer hold.

Answer 5

2, 3, and 5.

A prime number is a number that can only be divided by 1 and and itself. Whether 1 is a prime number is a matter of much debate.

Answer 6

a prime number is an integer (whole number) which does not have a factors other than 1 and itself. A factor is an integer when multiplied by another integer gives the number in question. Hence here 2,3,5 are all prime but 6,10,15,30 are not. 1 is a special number, it is a square number and it is universally considered not a prime number by mathematicians. A more interesting question is: is 0 a prime number?

Answer 7

1 2 3 5 are the prime numbers

Answer 8

2,3 & 5 are PRIME numbers as they can only be divided by themselves or one.
'1' is a special case.
6, 10, 15 & 30 are not prime numbers because they can be divided by the prime numbers.

Answer 9

2, 3, 5

Answer 10

1, 2, 3 and 5.

Prime numbers are divisible by themselves and the number 1.