400
No, 381 is not a prime number. Other than itself and 1, it is divisible by 3 and 127.
Telephone country code +381 (dialed as 00 381 from many places) is Serbia. However, there are no valid numbers beginning with +381 0.(The plus sign means "insert your international access prefix here." From a GSM mobile phone, you can enter the number in full international format, starting with the plus sign. The most common prefix is 00, but North America (USA, Canada, etc.) uses 011, Japan uses 010, Australia uses 0011, and many other countries use different prefixes.)
Since 352 is a smaller number than 381, he drove a shorter distance on Sunday than on Saturday. To find out how much less he drove on Sunday than Saturday, subtract the two numbers. 381 - 352 = 29 miles less that he drove on Sunday.
381 3,127
700-381 = 319
0.0079
1, 3, 127, 381
381
584 + 381 = 965
381 is divisible 3 and only 3
381 = 3 × 127