QQuestionGeology
QuestionGeology
Which number is a composite number? 23, 31, 17, 19, 57, 53
| | None of these |
| --- | --- |
| | 31 |
| | 53 |
| | 23 |
| | 57 |
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Answer
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Step 1: Identify the numbers that are not prime numbers, as composite numbers are numbers with more than two distinct positive divisors.
A prime number is a number greater than 1 that has no positive divisors other than 1 and itself. The numbers given are 23, 31, 17, 19, 57, and 53.
Step 2: Check the given numbers for primality.
- 23 is a prime number since its only divisors are 1 and 23. - 31 is a prime number since its only divisors are 1 and 31. - 17 is a prime number since its only divisors are 1 and 17. - 19 is a prime number since its only divisors are 1 and 19. - 57 can be factored as 3 x 19, so it is not a prime number; it is a composite number. - 53 is a prime number since its only divisors are 1 and 53.
Final Answer
57 is a composite number.
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