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4th grade

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What is a PRIME NUMBER?

  • 4th grade -

    A prime number can be divided, without a remainder, only by itself and by 1. For example, 17 can be divided only by 17 and by 1.
    Also, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, etc.

  • 4th grade -

    It is a number that cannot be divided by any whole number evenly except by 1 or itself.

    1,2,3,5 are prime number
    4,6,9 are not

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