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Q: Which number under 50 is neither prime or composite?

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1

So we eliminate prime numbers. Note that the number 1 is neither prime nor composite. We have left:4689101214151618202122242526272830323334353638394042444546484950515254555657586062636465666869707274757677788081828485868788909192939495969899100

91 is not a prime number. 91 is a composite number having the factors 1, 7, 13, and 91.

A number that isn't prime or composite is 1 its only factor is 1 (1 x 1).For a number to be prime, it should have two factors: 1 and itself.For a number to be composite, it should have more than two factors.1 has under two factors, which therefore makes it a "special number".

1 is not a prime number many people consider it to be one but to be a prime number it must only be divisible by 1 and itself. 1 is only divisible by one and nothing else. the number 1 is also not a composite. Composite numbers are divisible by 1, itself and another number which one is not. Instead it falls under a category called a unit

no, not all prime numbers are closed under addition. why? because, when you add 2 prime numbers you will not always get a prime number. example: 5+3= 8 5 and 3 are prime numbers but their sum is 8 which is a composite number..

1 is neither a composite nor a prime number. A prime number is one with exactly two positive divisors, itself and one. One has only one positive divisor. It cannot be written as a product of two factors neither of which is itself, so one is also not composite.A prime number is defined as being a natural number that is evenly divisible by exactly two distinct natural numbers. In the case of the number one, 1 is the only natural number that it can be evenly divided by. Thus, 1 has only one distinct divisor, not the required two necessary to make it a prime number. A numbers having this property is called a "unit".Even though it isn't a prime number, one has certain properties that make it even more special. For example, it's the building block for the other numbers:2 = 1 + 1,3 = 2 + 1,4 = 3 + 1.Also, it's what's called the identity element under multiplication; which means that when you multiply any number by one, you get that same number back. Specifically, 1 • X = X • 1 = X , where X is any number.It's neither.

Referring to only positive integers, the smallest composite number is 4 (2 x 2). A composite number is any number that is the product of two or more prime numbers.*Referring to all integers, it would be the negative number -9, (3 x -3), which is the also the arithmetically lowest one-digit number. However, under normal definitions, negative numbers are not considered prime or composite numbers.

A prime number is one that is only divisible by 1 and itself. Just work out if it divides into anything. To do this try dividing the number by all prime numbers under its half way value.

15

The largest prime number under 10,000,000 is 9,999,991

97 is the largest prime number under 100

The largest prime number under 200 is 199.

the largest prime number under 100 is 97

Neither carets nor lines are essential parts of factor trees, but some people find the use of them helpful in keeping track of the factors. A caret would only be placed under a composite number, indicating that it can be broken down into two factors. You can put a line under a prime number (or not.) Here's an example without either: 210 105,2 35,3,2 7,5,3,2

The greatest composite number under 100 is 99. The greatest composite factor of 100 is 100.

No, they are not. You can add two composite numbers, 15 and 14 for example, and get a sum, 29, that is prime.

The largest prime under 20 is 19.

Yes.

When the numbers are relatively prime.

19

293

97

691

743