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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 is a factor in math?

A: In mathematics, a factor of a base number is any number that can be evenly divided into the base number. Due to this definition, a factor can only be less ... Full Answer >Filed Under: -
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## What is 1992 in Roman numerals?

A: The Roman numeral equivalent of the number 1992 is MCMXCII. Writing this number in Roman numerals requires breaking the number down into 1900 plus 90 plus ... Full Answer >Filed Under: -
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## What are some interesting facts about the number 10?

A: Some interesting facts about the number 10 include the Korean alphabet has 10 vowels, Virginia was the 10th state to enter the Union and the metric system ... Full Answer >Filed Under: -
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## How do you find a missing number when you already know the mean?

A: To find a missing number in a data set given the mean of the data set, count the total number of data points in the data set, including the missing number,... Full Answer >Filed Under: