The number 8 is composite. So it is not prime, technically, because it only has 1 as a factor. They have âfactorsâ. 3/1 = 3. The last digit is not 0 or 5, and it is not a multiple of 7. For example, 2 and 5 are factors of 10. Example 1: 6 can be divided evenly by 2, so 6 is a composite number. Hence it is a composite. Factors are the numbers that divide into it. Composite numbers are whole numbers that can be divided by numbers other than itself and 1. To do this, you should check to see if the number can be divided by these common factors: 2, 3, 5, 7, 11, and 13. Example: 5 is a prime number. In the same way, 2, 5, 7, 11, 13, 17 are prime numbers. A composite number has more than two factors. Yes because 7x6x5x4x3x2x1+5 = 5(7x6x4x3x2x1+1) = 5(1008+1) = 5(1009) Since it has more than 1 factor that is 5 and 1009 So it is a composite number Every other even number other than 2 is composite. 5 × 2 × 2 × 23. Every composite number can be written as the product of two or more (not necessarily distinct) primes. The best way to figure out if itâs a composite number is to perform the divisibility test. It does not have two factors. 1-- 1 is only divisible by 1. In problem 2 above, the number 8 has four factors. When a number can be divided up exactly it is a Composite Number; When a number cannot be divided up exactly it is a Prime Number; So 6 is Composite, but 7 is Prime. 5 x 7 x 13 + 5. If the number ends with a 0 or 5, try dividing by 5. Definitions. But in order to be prime, you have to have exactly two factors. For example, the composite number 299 can be written as 13 × 23, and the composite number 360 can be written as 2 3 × 3 2 × 5; furthermore, this representation is unique up to the order of the factors. 3/3 = 1. Now, here is an interesting case. 6 has more than 2 factors. Hence it is prime number. 1 has only one factor. If the number is even, then start with the number 2. Example 2: 5 cannot be divided evenly (except by 1 and 5), so is not a composite number (it is a so called prime number). Every whole number higher than 1 is either a composite number or a prime number. Solution : To find the primality of 5 and 6, first we need to find the factors of the numbers 5 = 1x5 6 = 1x6, 2x3 , 3x2 5 has only 1 and 5 as its factors. In other words a composite number is a positive integer that can be formed by multiplying together two smaller positive integers. A prime number has only two factors: 1 and itself. A whole number that can be divided evenly by numbers other than 1 or itself. Find whether the numbers 5 and 6 are Prime or Composite Number? Composite number: A whole number that can be divided exactly by numbers other than 1 or itself. 1 is itself. The number 11 is also a prime number because it only has two factors: 1 and 11 Example 3 Identify prime and composite numbers from the following list: 73, 65, 172, and 111 Solution Number 73 is a prime number. 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