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2 cause it is a even number but it's a Prime number. Factors 1x2=2
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What numbers are not prime numbers?
Any natural number with exactly two unique factors, 1 and itself, is a prime number. Any other natural number is composite, not prime. So, some numbers that are not prime are 0, 1, negative numbers, fractions, decimals, irrational numbers, and imaginary numbers. Here are some numbers that are not prime numbers.1/25/60.06250511.39π√23iAll integers greater than one (the natural numbers) that are not prime numbers are composite numbers. Composite numbers are integers that have more than two factors, including 1. Here is a list of some numbers and whether they are prime numbers or composite numbers.1 - unity, neither prime nor composite2 - prime3 - prime4 - composite (factors are 1, 2, and 4)5 - prime6 - composite (factors are 1, 2, 3, and 6)7 - prime8 - composite (factors are 1, 2, 4, and 8)9 - composite (factors are 1, 3, and 9)10 - composite (factors are 1, 2, 5, and 10)___________________Any natural number (of 2 or more digits, understood throughout this answer) that ends with 0, 2, 4, 5, 6 or 8 must be a composite number and therefore cannot be prime. Primes will end only with 1, 3, 7 or 9, but composite numbers can end with any digit.Any number with a digital root* of 3, 6 or 9 must be a composite number and therefore cannot be prime. A prime number will have a digital root that equals 1, 2, 4, 5, 7 or 8, but composite numbers can have a digital root of any nonzero integer.*The digital root of a number is the result of adding a number's digits, continuing to add the digits of the sum, until you are left with one single digit. You can add the digits in any order, and can add the digits of the accumulated sum at any time; the result will always be the same if done accurately.Even if given a very long number that ends in 1, 3, 7 or 9, you might be able to stun people by accurately stating that the number must be composite, if you mentally calculate the digital root and find it to be 3, 6 or 9. You won't be able to isolate every single composite, but with a digital root of 3, 6, or 9, you can be certain that THAT number IS composite.Any natural number divided by 6 is composite if the digital fraction is equal to .0 exactly, .5 exactly, .3333 repeating, or.6666 repeating.
Is the product of 2 numbers a prime number?
The product of two numbers could be either a composite number or a prime number. If one of those numbers is 1 and the other is a prime number, the result is that prime number. If neither number is 1, the product of the two numbers will be a composite number. If one of those numbers is 1 and the other is not a prime number, the product will not be a prime number. So, in most cases, it will be a composite number.
What digits might composite numbers greater than 10 have in the ones place. 12345.?
Composite numbers can have any digit in the ones place: All multiples of 3 greater than 10 will be composite numbers (the first one being 3×4 = 12). The last digit of the multiples of 3 follow the pattern (starting at 12, ending at 39): {2, 5, 8, 1, 4, 7, 0, 3, 6, 9} which includes all the digits {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}. Thus the last digit of composite numbers greater than 10 can contain any digit.
Can you make a symmetric factor tree for every composite number?
No you cannot. You might want to try the factor tree for 27.
If you add a prime number and a prime number will the sum always be prime?
If you add two prime numbers that are odd numbers, the sum will be an even number. Because even numbers are divisible by 2, no even number greater than 2 is a prime number. Here are some examples:3 + 3 = 6 which is an even number and thus not a prime number5 + 7 = 12 which is an even number and thus not a prime number11 + 13 = 24 which is an even number and thus not a prime number19 + 41 = 60 which is an even number and thus not a prime numberIf you add a prime number that is odd to the only even prime number (2), you will have an odd number. This odd number might be prime or might be composite. Here are some examples:2 + 3 = 5 which is a prime number2 + 7 = 9 which is a composite number2 + 23 = 25 which is a composite number2 + 41 = 43 which is a prime numberQuestion what is zero = composite0 x 1 = 00 x 4 = 00 x 16 = 00 x 64 = 0
