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You need to carry out the division. If the remainder is 0 then it is divisible, if not it is not.

There are divisibility rules which can help with small or simple divisors but these are quite limited.

Q: How do you know if a natural number is divisible by another natural number?

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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.

the number will also be divisible by 3 and 2

If a number is even, it's divisible by two.

Try dividing the number by 19. If the answer is a whole number (with no remainder), then the number is divisible by 19.

No.A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.

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663 is divisible by i dont know . but i do know that it can not be a even number so it has to be divisible by a odd number

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.

the number will also be divisible by 3 and 2

If a number is even, it's divisible by two.

Divide the number by nineteen. If the answer is a whole number, then the number is divisible.

If a number ends in 5 or 0, that number is divisible by 5.

All numbers are divisible by one.

Take the number 3336. You know it's divisible by 1 because everything is. You know it's divisible by 2 because it's even. You know it's divisible by 3 because the digits add up to a multiple of 3 and you know it's divisible by 4 because the last two digits are divisible by 4. So you've found at least four factors: 1,2,3 and 4.

If the number ends in 0 or 5 it's divisible by 5

Try dividing the number by 19. If the answer is a whole number (with no remainder), then the number is divisible by 19.

No.A very quick way to know whether or not a number is divisible by is adding up the numbers within the number. And see if the new number is divisible by 3.For instance, the number 527, add 5, 2, and 7 together. (5+2+7=14) The answer, 14, is not divisible by 3.Another example would be the number 168. 1+6+8=15 The number 15 is divisible by 3, therefore the number 168 is divisible by 3.

If it ends in a zero, it's divisible by 10.