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A prime number is a number with two and only two factors: 1 (also known as unity) and itself. A composite number is a number with more than two factors; in other words, it has at least one factor besides 1 and itself. 1000 has factors other than 1 and itself, so it is not a prime number. For example, it is divisible by 10 because it ends with a 0. Therefore, 1000 is a composite number.
The only number that goes into 183 and 1000 is 1. The prime factors of 183 are 3 and 61. The prime factors of 1000 are 2, 2, 2, 5, 5, and 5. No prime factors are shared, so the two numbers are relatively prime, meaning their GCD (greatest common divisor) is 1.
Any number that has only two factors which are itself and one is a prime number.
28 has the most factors: 6 Factors for 25 are: 1, 5, 25 Factors for 26 are: 1, 2, 13, 26 Factors for 27 are: 1, 3, 9, 27 Factors for 28 are: 1, 2, 4, 7, 14, 28 Factors for 29 are: 1, 29
The only common factor of 183 and 1000 is 1.