Prime Number or Composite Number?? How to know if the number is prime or not? #fastandeasymaths

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198 is 11 × 18 so i know that 197 is not a multiple of 11 neither 13 as 169 + 28 = 197 and not *+26*
Its not a multiple of 2 3 or 5 either neither is 19 - 14 = a multiple of 7
So it is prime

huzefa