The factors of 15863 are 1, 29, 547, 15863, so the non trivial ones are 29 and 547.
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144 is the only non-trivial square.
There is no non-trivial equivalent.
Divide each number by 2, resulting in 38/15. The only non-trivial integral factors of 15 are 3 and 5; neither of these is an integral factor of 38; therefor, the simplification can not proceed further.
Zero is a multiple of any integer. We generally don't list it, preferring the non-trivial multiples.
36 is the smallest non-trivial number. It is both square and triangular.