Because you can subtract a whole number of sevens from 2275 and not leave a remainder. That is one definition of "divisible".
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81 with remainder 7.
All the multiples of 325 (which are infinite), starting with: 325, 650, 975, 1300, 1625, 1950, 2275 . . .
2275 has 12 factors.
No it is not divisible by 7
No, but 504 is divisible by 7.