A Prime number has exactly two factors, 1 and the number itself. No even number greater than 2 is a prime because any even number can be divided by 2 as well as by 1 and the number itself.
2 is the first prime number, followed by 3, because there are no smaller numbers that can be divided evenly into them.
5, 7, 11, 13, 17, 19, 23, and 29 are the next primesbecause 1 is the only smaller number with which any of them can be can be divided. All other numbers between 2 and 19 are either even numbers (4, 6, 8, 10, 12, 14, 16, and 18) except 9 and 15, which can both be divided by 3.
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To find the sum of the first ten prime numbers, you first have to find what the first 10 prime numbers are. They are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29. Added together they equal 129.
2,3,5,7,11,13,17,19,23,29- that's the first 10
10 does not have 6 prime numbers.
The LCM of two numbers is the product of the numbers if one of the numbers is a prime. Since 11 is a prime, the LCM of 10 and 11 is 110 (10 x 11). If neither number had been a prime, the LCM would have been the product of all the prime factors of the numbers to their greatest power.
5 is prime, the rest aren't.