9514 1404 393
Answer:
   3210 = 2·3·5·107
   3528 = 2³·3²·7²
Step-by-step explanation:
Divisibility rules help.
A number is divisible by 2 if it is even.
A number is divisible by 3 if the sum of digits is divisible by 3.
A number is divisible by 5 if it ends in 5 or 0.
A number is divisible by 7 if subtracting twice the 1s digit from the rest of the number results in a number divisible by 7.
<h3><u>3210</u></h3>
   Even, and ends in 0, so is divisible by 2·5
   3210/10 = 321
   Sum of digits is 6, so is divisible by 3
   321/3 = 107
   None of the divisibility rules applies, and √107 ≈ 10.3, so there are no prime factors of 107.
   3210 = 2·3·5·107
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<h3><u>3528</u></h3>
   Ends in 2 digits divisible by 4, so is divisible by 4
   3528/4 = 882
   Even, so is divisible by 2
   882/2 = 441
   Sum of digits is 9, so is divisible by 9
   441/9 = 49
   This is recognizable as the square of 7.
   3528 = 2³·3²·7²