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They are: 1*53 = 53 because it is a Prime number
49 and 4
53
143
1 x 159, 3 x 53
-49 and -4
249
no whole numbers multiply to 53 except 1 and 53. 53 is prime
106
212
Since 1000 = 103 = (2*5)3 = 23*53, the answer is 23 = 8 and 53 = 125.