All multiples of 531 are divisible by 531, namely:
531, 1062, 1593, 2124, 2655, 3186, 3717, 4248, 4779, 5310, 5841, 6372, 6903, 7434, 7965, 8496, 9027, 9558, 10089, 10620, 11151, 11682, 12213, 12744, 13275, 13806, 14337, 14868, 15399, 15930, 16461, 16992, 17523, 18054, 18585, 19116, 19647, 20178, 20709, 21240, 21771, 22302, 22833, 23364, 23895, 24426, 24957, 25488, 26019, 26550, 27081, 27612, 28143, 28674, 29205, 29736, 30267, 30798, 31329, 31860, 32391, 32922, 33453, 33984, 34515, 35046, 35577, 36108, 36639, 37170, 37701, 38232, 38763, 39294, 39825, 40356, 40887, 41418, 41949, 42480, 43011, 43542, 44073, 44604, 45135, 45666, 46197, 46728, 47259, 47790, 48321, 48852, 49383, 49914, 50445, 50976, 51507, 52038, 52569, 53100, ...
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All multiples of 531, which is an infinite number.
531 is one of them and that any 3 digit number whose digital sum is 9 is also divisible by 9
Yes. If the sum of a number's digits add up to 3 (or a multiple of 3) then the number is divisible by 3. 5 + 3 + 1 = 9 : as 9 is a multiple of 3 then 531 is divisible by 3 (177 x 3 = 531). NOTE : A similar process applies to identify if a number is divisible by 9. If the sum of the number's digits add up to 9 (or a multiple of 9) then the number is divisible by 9. 5 + 3 + 1 = 9 : 531 = 59 x 9.
531 is not a prime number. Other than itself and one, it is also divisible by 3, 9, 59, and 177.
All numbers are divisible by 1.