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It's an even number, so it contains a factor of 2.
486/2 = 243.
So 486 = 2 * 243
243 is odd so no more factors of 2.
Is 243 a multiple of 3? Yes. 243/3 = 81 (no remainder).
So 486 = 2 * 3 * 81
81 should look familiar: 9*9 = 81. And we know that 9 = 3*3
Putting it all together:
486 = 2 * 3 * 3 * 3 * 3 * 3
486 = 2 * 3^5
Prime factors are 2 (once) and 3 (five times)
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What number less than 100 has exactly 4 prime factors?
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The factors of 1993 are: 1 1993 The prime factors are: 1993 is a prime number.
