For Example:

The checksum for Mobile Number +60104940395 is 731.

Step-by-step:

Remove the leading plus sign ("+") from the mobile number:
+60104940395 → 60104940395
Assign weight factors using consecutive prime numbers:
2 3 5 7 11 13 17 19 23 29 31 37 ..
Multiply each digit of the mobile number with its corresponding weight factor:
(6x2) + (0x3) + (1x5) + (0x7) + (4x11) + (9x13) + (4x17) + (0x19) + (3x23) + (9x29) + (5x31)
Add the products together to obtain the checksum, which is 731.

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