1 and 13.
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Nothing goes into 13 evenly other than 1 and 13, so that means it is a prime number.
The two square roots of the number, '169', are +13 and -13 .
Only 1. 13 is a prime number.
There is only one number that equals 13. That number is . . . . . 13.
1 and 13. 13 is a prime number, thus only 1 and itself can go into it.