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Multiples of 983 include 983, 1966, 2949 and 3932. For them to be common, they need to be compared to another set of multiples.
The key point to consider with multiples of 5 is that 10 is divisible by 5. Thus any digits in the tens column or greater are irrelevant. The only possible units figures for a multiple of 5 are 5 and 0. Therefore the one thing multiples of 5 have in common is that they all end in either 5 or 0. All the multiples of 5 are NOT prime numbers. 5 is a prime number but its multiples are not.
Only one number can be the LCM. That's 187. The next one is 374.
Multiples of 19 include 19, 38 and 57. For them to be common, they need to be compared to another set of multiples.
2 is one number whose multiples include the ones given. It is not the only one, nor the largest.