AC Lim's answer to Juliana's Secondary 1 Maths Singapore question.
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Hope this helps
Date Posted:
1 year ago
Thanks AC Lim. What are the way to determine if a number is prime number if the number is huge?
If the number is
Even number 2582, 9980 can be divided by 2
Last digits is 0 or 5 example 2255, 6650 can be divided by 5
Sum of digits is multiple of 3, example 3348=3+3+4+8= 18 or 6351=6+3+5+1=15 can be divide 3
All above numbers are composit number. Hence, is not prime number.
Other number, you can try divide by 4,6,7,8,9 if no remainder = not a prime number
Even number 2582, 9980 can be divided by 2
Last digits is 0 or 5 example 2255, 6650 can be divided by 5
Sum of digits is multiple of 3, example 3348=3+3+4+8= 18 or 6351=6+3+5+1=15 can be divide 3
All above numbers are composit number. Hence, is not prime number.
Other number, you can try divide by 4,6,7,8,9 if no remainder = not a prime number
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