Because it is relatively easy to divide the number into a group of 1 and 3. Much harder to do that with a 16-digit number!
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This is not true. Think about any 4 digit multiplied by 1. This remains a 4 digit. In the case of any 4 digit under 5000, multiplied by two would also be a 4 digit number
Every square of a 4 digit number has more than four digits.
Yes A 4 digit is like 1111 A 5 digit is like 11111
10,003
what is the 4 digit number to activate bbm please