There are many..... 14, 21, 28, 35, 42, 49, 56... Continue adding 7 until you get to infinity and you will have a list of them all. 14/7=2, 21/7=3...etc. Unless of course you mean what is a whole number by which 7 is divisible? In that case you have 7 and 1 and no other. 7/1=7 and 7/7= 1
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If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7.
Not to an exact whole number.
42
If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7. or Divide 7 into it. If the answer has no remainder, the number is divisible by 7.
If the number is even, it's divisible by 2. If the sum of the digits is a multiple of 3, the whole number is divisible by 3. If the last two digits are a multiple of 4, the whole number is divisible by 4. If the last digit is a 0 or a 5, the whole number is divisible by 5. If the number is even and divisible by 3, it's divisible by 6. If the last digit doubled subtracted from the rest is a multiple of 7, the whole number is divisible by 7. If the last three digits are a multiple of 8, the whole number is divisible by 8. If the sum of the digits is a multiple of 9, the whole number is divisible by 9. If the number ends in 0, it's divisible by 10.