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# Is 61 a prime number?

Sixty-one is a prime number. It is the 18th prime number in the series. It is also a centered square number, a centered hexagonal number and a centered decagonal number and the sum of two square numbers.

Continue ReadingPrime numbers are whole numbers larger than 1 that can't be divided by any number other than 1 and itself and still result in a whole number. Prime numbers are always odd, because any even number greater than 2 can be divided by 1, 2 and itself. Similarly, any number ending in 5 can't be prime, because it can be divided by 1, 5 and itself.

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## What are some interesting facts about the number 30?

A: Some interesting facts about the number 30 are that it is an even number that has eight factors, of which three are the prime numbers 2, 3 and 5. The prime... Full Answer >Filed Under: -
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## What is an estimated digit?

A: The last digit in any number is referred to as the estimated digit. In science, all other numbers are considered significant digits because they are precis... Full Answer >Filed Under: -
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## How do you write in scientific notation?

A: Writing in scientific notation involves taking a very small or very large number, converting it to an easy-to-read decimal, and raising it to a power of 10... Full Answer >Filed Under: -
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## What are some ways for teachers to use number lines?

A: Teachers can use the number line to show students how to add and subtract numbers, such as two positive or two negative numbers, and a positive with a nega... Full Answer >Filed Under: