PRIME
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No, 315 is not a prime number. It is called a composite number. A prime number is a number that is only divisible by one and itself. For example, the number 11 is a prime number since only 11 and 1 go into 11 evenly. 315 is divisible by other numbers (ex: it is divisible by 5)
Prime numbers are only divisible by 1 and themselves. Since 3 is not a prime number, any prime number divisible by 3 does not exist. Therefore, the set of prime numbers divisible by 3 is an empty set.
61 is a prime number. Therefore, 61 is only divisible by 1 and 61.
These numbers are called prime. There are many,many prime numbers, some of which are 13,23, and 7
Prime numbers are such number which are only divisible by 1 and by itself only..{1,2,3,5,7,11,13,17}