89.
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To the nearest ten it is 890
Yes, 887 is a prime number. Recall that if a number is not prime then there exists a prime less than the square root of the number and this prime divides the number. So we need to check if the primes less than 30 divides 887 or not. These primes are 2,3,5,7,11,13,17,19,23,29.
It is 887
887 in Roman numerals is DCCCLXXXVII
8.87