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# Why isn't 87 a prime number?

87 is not a prime number because 87 is divisible by 3 and 29.

# What are the factors and prime factors of 1180?

1180 is a composite number because it has factors other than 1 and itself. It is not a prime number. The 12 factors of 1180 are 1, 2, 4, 5, 10, 20, 59, 118, 236, 295, 590, a…nd 1180. The proper factors of 1180 are 1, 2, 4, 5, 10, 20, 59, 118, 236, 295, and 590 or, if the definition you are using excludes 1, they are 2, 4, 5, 10, 20, 59, 118, 236, 295, and 590. The prime factors of 1180 are 2, 2, 5, and 59. Note: There is repetition of these factors, so if the prime factors are being listed instead of the prime factorization, usually only the distinct prime factors are listed. The 3 distinct prime factors (listing each prime factor only once) of 1180 are 2, 5, and 59. The prime factorization of 1180 is 2 x 2 x 5 x 59 or, in index form (in other words, using exponents), 22 x 5 x 59. NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.

# Is 1180 a prime number?

No all numbers ending in 0 (zero) are divisible by 10 and therfore divisible by at least 5 and 2. 1180 has the prime factors: 2 * 2 * 5 * 59

# What is a number that isn't a prime number?

1, 4, 6, 8, 9, 12, 14, 15, 16, 18, 20, 21, 22...

# Why isn't 49 a prime number?

49 is not aprime number because 7 times 7 = 49

# Why is 1180 not a prime number?

It dose not end in 0,2,4,6 or 8 and not disible by 2.

# What is the prime factorization of 1180?

1180 = 2 x 2 x 5 x 59

# Why isn't 2001 a prime number?

Because 2001 is exactly divisible by three !

# Why isn't 15 a prime number?

A number is prime if it has only 1 and itself as factors. For example, 7 is a prime number because it has only 1 and 7 as factors. 15 isn't a prime number because it has 1, 3,… 5, and 15 as factors.

# Why isn't 111 a prime number?

Because its factors include 3 and 37.

# Why isn't 230 a prime number?

230 is an even number. No even numbers greater than 2 are prime because they are all divisible by 2 as well as by themselves and 1. 230 is also divisible by 5, 10, 23, 46, and… 115.

# Why isn't 81 a prime number?

Because it has other factors other than 1 and itself

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# Why isn't 387 a prime number?

Because it has more than two factors.

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# Why isn't 115 a prime number?

Other than the number 2, primes only end in 1, 3, 7, or 9. Also, 115=5x31

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# Why isn't 27 a prime number?

As the definition of a prime number is 'a number that can only be divided by one or itself, and still leave a whole number.' Anything in the eight times table would be divisib…le by two and four. 27 can also be divided by both three and nine.

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# Why isn't 20 a prime number?

A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.

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# Why isn't one a prime number?

In number theory, the fundamental theorem of arithmetic, also called the unique factorization theorem or the unique-prime-factorization theorem, states that every intege…r greater than 1 either is prime itself or is the product of prime numbers, and that this product is unique, up to the order of the factors. For example, 1200 = 24 Ă— 31 Ă— 52 = 3 Ă— 2 Ă— 2 Ă— 2 Ă— 2 Ă— 5 Ă— 5 = 5 Ă— 2 Ă— 3 Ă— 2 Ă— 5 Ă— 2 Ă— 2 = etc. The theorem is stating two things: first, that 1200 can be represented as a product of primes, and second, no matter how this is done, there will always be four 2s, one 3, two 5s, and no other primes in the product. The requirement that the factors be prime is necessary: factorizations containing composite numbers may not be unique (e.g. 12 = 2 Ă— 6 = 3 Ă— 4). This theorem is one of the main reasons for which 1 is not considered as a prime number: if 1 were prime, the factorization would not be unique, as, for example, 2 = 2Ă—1 = 2Ă—1Ă—1 = ...