I've never heard of a "friendly number strategy" per se; but there are specific rules for "divisibility" that you can use to help break up large numbers. For example, if the number is even, it is divisible by 2; if the sum of the numbers
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The divisibility rules for a prime number is if it is ONLY divisible by 1, and itself.
Divisibility is when a number divides into another number with no remainder.
Divisibility is when a number divides into another number with no remainder.
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Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".Here is a very simple algorithm: Call your number "n". You might test divisibility by every number, starting at 2. If the first number by which a number is divisible is equal to "n", then it is a prime number. - Faster algorithms are possible; for example, you really only need to test divisibility by all numbers, up to the square root of your number "n".