to be divisible (by); to be divided without residue (remainder)
to be satisfied; to be convinced
偶数は必ず2で割り切れる。
Any even number is divisible by 2.
12は3と4の両方で割り切れた。
12 was divisible by both 3 and 4.
9は偶数でないので2で割り切れない。
9 is not even, so it is not divisible by 2.