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MLA Style spells out numbers that can be written in one or two words (three, fifteen, seventy-six, one thousand, twelve billion) and to use numerals for other numbers (2; 584; 1,001; . APA Style, on the other hand, generally uses words for numbers below 10 and numerals for numbers 10 and above.
The Chicago Manual of Style, The Bluebook and the ALWD Guide to Legal Citation all suggest spelling out numbers from zero to ninety-nine. Always spell out a number at the beginning of a sentence. If you can’t abide by that simple rule in a particular instance, then you must rewrite the sentence.
Garner’s Modern American Usage says it was originally done in legal writing to prevent fraudulent alterations. I guess if you had to alter both the word and the numeral, it would be harder than if you had to alter just one or the other.
I was surprised because among mathematicians, 1 is universally regarded as non-prime. The confusion begins with this definition a person might give of “prime”: a prime number is a positive whole number that is only divisible by 1 and itself. The number 1 is divisible by 1, and it’s divisible by itself.
For 11, the answer is: yes, 11 is a prime number because it has only two distinct divisors: 1 and itself (11). As a consequence, 11 is only a multiple of 1 and 11.
A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.