A prome number (1, 5, 7, 11, 13, 17, 19 etc.) divisible only by itself and 1.
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Prime numbers.
No.A number a is divisible by another number b, if and only if the fraction a/b is equivalent to a whole number. And as you know, 1/2 = 0.5, which is not a whole number, hence is 1 not divisible by 2.The only number 1 is divisible by, is 1 itself. All numbers are divisible by 1.
673 is divisible by 1 and 673 (it is a prime number).
All numbers are divisible by 1. So, apart from the number 1, all numbers are divisible by another number. These numbers are therefore prime or composite.
143 is not a prime number; it is divisible by 11 and 13.Incidentally, it is divisible by 1; all numbers are.