427 = 42 tens, plus 7 ones
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0 or 5
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
97The only candidates are 64, 75, 86, and 97. 97 is the only prime in that group.
Yes except for 2 on its own which is the only even prime number
32 is an even number (look at the ones place). The only even prime is 2. 95 has 5 as a factor (again look at the ones place). Multiples of 5 have a 0 or 5 in the ones place.That is how you figer out if 32 and 95 in not a prime number.