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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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Q:
## Why is 11 not pronounced as "onety-one"?

A: While "onety-one" or "oneteen" would seem to make sense as pronunciations for the number 11, the origin of the word "eleven" is the Old English word "endle... Full Answer >Filed Under: -
Q:
## How is "1950" written in Roman numerals?

A: The number 1950 is written in Roman numerals as MCML. 1000 is M, 100 is C (thus 900 would be CM, or 100 less than M) and 50 is L. Roman numerals are the nu... Full Answer >Filed Under: -
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## What are the factors of 64?

A: The full prime factorization of 64 is 2 x 2 x 2 x 2 x 2 x 2. The prime factorization of a number is computed by dividing the number by a small prime number... Full Answer >Filed Under: -
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## What information is included in a chart of numbers?

A: A number chart is a table of numbers used to train students to count numbers. Typically, a number chart starts with either 0 or 1 and counts up one whole n... Full Answer >Filed Under: