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The second three digits in a phone number refer to an exchange. An exchange includes several thousand people or phones.
'17' is a prime number. The sum of the digits is 1 + 7 = 8 > 7.
I am a 3 digit number divisible by 7 but not 2 the sum of my digits is 4 what number am I
Phone numbers are seven digits long in some countries but differing lengths in others. It purely depends upon what number of phone numbers the country needs .
A London (UK) phone number has 8 digits. If you wish to dial a London (UK) phone number from outside the London area (or a mobile phone) you need to prefix the 8 digits by the 3 digit London area code of 020 (which would normally be displayed in brackets before the number viz: (020) yxxx xxxx - the y is either 3, 7 or 8). If you wish to dial it from outside the UK, you'll need the international prefix for your country, followed by the country code of 44 plus the London area code without the leading zero plus the 8 digits, ie: +44 20 yxxx xxxx