A number is divisible by 91 if it can be divided by 91 without leaving a remainder. To determine if a number is divisible by 91, you can check if it is divisible by both 13 and 7, which are the prime factors of 91 (13 x 7 = 91).
For example, 91 is divisible by 13 because 91 divided by 13 equals 7 with no remainder. Similarly, 91 is divisible by 7 because 91 divided by 7 equals 13 with no remainder.
Another way to check if a number is divisible by 91 is to add the digits in the number and see if the sum is divisible by 91. For example, the number 273 is divisible by 91 because 2 + 7 + 3 = 12, and 12 is divisible by 91.
In general, a number is divisible by 91 if it is a multiple of 91, meaning it can be expressed as 91 times an integer.
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