The short answer is yes. But you must determine the number of bytes per word. Some architectures call two bytes a word, and four bytes a double word. In any case, you simply mentally calculate addr%word_sizeor addr&(word_size - 1)and see if it is equal to zero. When the address is hexadecimal, this is trivial: just look at the rightmost digit and see if it is divided by the size of the word.
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